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Degraded Performance
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Maintenance
Scheduled Maintenance
DI SMS 365 (iSMS) | Operator Services | Application Maintenance | PCR Number # PCRSDI-12305 Jul 14, 2026 05:30-10:30 UTC
Services: DI SMS 365 (iSMS)
PCR Number: PCRSDI-12305
Start Date and Time (GMT) :: 14th July 2026 5:30:00 Hrs.
End Date and Time (GMT) :: 14th July 2026 10:30 Hrs.
Impact
Mobile Terminating (MT) Traffic: No impact expected.
Mobile Originated (MO) Traffic: No impact expected.
DR Notification: No impact expected.
Report Manager Access: Not impacted
Report Manager Statistics: Not impacted
Description:
Sinch Digital Interconnect has scheduled a planned maintenance to carry out activities on the internal applications; no impact is expected during this activity.
If you experience any issues during this maintenance, please contact the Operator Service NOC immediately at operatorservices.noc@sinch.com or +1 470.300.8394 (select ‘Support’ from the menu, option 2 for Digital Interconnect and then option 1) and reference this notification.
Posted on Jul 13, 2026 - 21:38 UTC
PCR Number: PCRSDI-12305
Start Date and Time (GMT) :: 14th July 2026 5:30:00 Hrs.
End Date and Time (GMT) :: 14th July 2026 10:30 Hrs.
Impact
Mobile Terminating (MT) Traffic: No impact expected.
Mobile Originated (MO) Traffic: No impact expected.
DR Notification: No impact expected.
Report Manager Access: Not impacted
Report Manager Statistics: Not impacted
Description:
Sinch Digital Interconnect has scheduled a planned maintenance to carry out activities on the internal applications; no impact is expected during this activity.
If you experience any issues during this maintenance, please contact the Operator Service NOC immediately at operatorservices.noc@sinch.com or +1 470.300.8394 (select ‘Support’ from the menu, option 2 for Digital Interconnect and then option 1) and reference this notification.
Posted on Jul 13, 2026 - 21:38 UTC
Sinch Scheduled Maintenance - Elastic SIP Trunking (US) and Voice API (all regions except EU) -rescheduled from June 30 Jul 14, 2026 12:00-13:00 UTC
Update -
We will be undergoing scheduled maintenance during this time.
Jul 08, 2026 - 21:16 UTC
Jul 08, 2026 - 21:16 UTC
Update -
We will be undergoing scheduled maintenance during this time.
Jul 08, 2026 - 21:14 UTC
Jul 08, 2026 - 21:14 UTC
Scheduled -
Please note the scheduled maintenance originally scheduled for June 30, 2026 has been postponed to July 14, 2026.
--------
Sinch Elastic SIP Trunking will be undergoing maintenance to update SBCs [Session Border Controller] & SIP Registrars that will impact how inbound DID calls are delivered to your equipment over TCP and TLS. The Sinch SBCs will now consistently use source port 5060/5061 when initiating TCP/TLS connections to your PBX or SIP endpoint. Previously, these connections originated from a random source port. Additionally, we will be updating the default SIP TLS certificate from ECDSA to RSA to provide broader compatibility with VoIP equipment.
The scheduled work is not expected to impact services. This change improves consistency and predictability in how our signaling traffic reaches your equipment. This is being sent as a courtesy notice in the event that you experience issues with your service during the maintenance window.
We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled we will advise you accordingly. Please contact support@sinch.com for further information.
Jun 30, 2026 - 13:56 UTC
--------
Sinch Elastic SIP Trunking will be undergoing maintenance to update SBCs [Session Border Controller] & SIP Registrars that will impact how inbound DID calls are delivered to your equipment over TCP and TLS. The Sinch SBCs will now consistently use source port 5060/5061 when initiating TCP/TLS connections to your PBX or SIP endpoint. Previously, these connections originated from a random source port. Additionally, we will be updating the default SIP TLS certificate from ECDSA to RSA to provide broader compatibility with VoIP equipment.
The scheduled work is not expected to impact services. This change improves consistency and predictability in how our signaling traffic reaches your equipment. This is being sent as a courtesy notice in the event that you experience issues with your service during the maintenance window.
We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled we will advise you accordingly. Please contact support@sinch.com for further information.
Jun 30, 2026 - 13:56 UTC
Sinch Scheduled Maintenance - Voice API (EU regions) Jul 14, 2026 19:00-19:30 UTC
Update -
We will be undergoing scheduled maintenance during this time.
Jul 08, 2026 - 21:17 UTC
Jul 08, 2026 - 21:17 UTC
Update -
We will be undergoing scheduled maintenance during this time.
Jun 30, 2026 - 13:38 UTC
Jun 30, 2026 - 13:38 UTC
Scheduled -
Please note the scheduled maintenance has been postponed to July 14, 2026.
----
Sinch Voice API- EU Region will be undergoing maintenance to update SBCs [Session Border Controller] & SIP Registrars that will impact how inbound DID calls are delivered to your equipment over TCP and TLS. The Sinch SBCs will now consistently use source port 5060/5061 when initiating TCP/TLS connections to your PBX or SIP endpoint. Previously, these connections originated from a random source port. Additionally, we will be updating the default SIP TLS certificate from ECDSA to RSA to provide broader compatibility with VoIP equipment.
The scheduled work is not expected to impact services. This change improves consistency and predictability in how our signaling traffic reaches your equipment. This is being sent as a courtesy notice in the event that you experience issues with your service during the maintenance window.
We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled we will advise you accordingly. Please contact support@sinch.com for further information.
Jul 14, 2026 - 19:00 UTC
----
Sinch Voice API- EU Region will be undergoing maintenance to update SBCs [Session Border Controller] & SIP Registrars that will impact how inbound DID calls are delivered to your equipment over TCP and TLS. The Sinch SBCs will now consistently use source port 5060/5061 when initiating TCP/TLS connections to your PBX or SIP endpoint. Previously, these connections originated from a random source port. Additionally, we will be updating the default SIP TLS certificate from ECDSA to RSA to provide broader compatibility with VoIP equipment.
The scheduled work is not expected to impact services. This change improves consistency and predictability in how our signaling traffic reaches your equipment. This is being sent as a courtesy notice in the event that you experience issues with your service during the maintenance window.
We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled we will advise you accordingly. Please contact support@sinch.com for further information.
Jul 14, 2026 - 19:00 UTC
External Maintenance - Toll-Free Number Provider (US and CA) Jul 16, 2026 03:00-07:00 UTC
We are writing to inform you that our Toll-Free Number Provider (US and CA) will be performing planned maintenance at the times specified below:
Start Time: 2026-07-16 03:00 UTC
End Time: 2026-07-16 07:00 UTC
Impact SMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States and Canada.
Impact MMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States.
Posted on Jun 02, 2026 - 00:58 UTC
Start Time: 2026-07-16 03:00 UTC
End Time: 2026-07-16 07:00 UTC
Impact SMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States and Canada.
Impact MMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States.
Posted on Jun 02, 2026 - 00:58 UTC
Planned Maintenance - REST Traffic Database Upgrade Jul 16, 2026 09:00-10:00 UTC
We are writing to inform you that, as part of our continuous efforts to improve the performance, stability, and reliability of our platform, we will be performing scheduled maintenance on the REST Traffic platform at the times specified below.
Type: Maintenance – REST Traffic Database Upgrade
Start Time: 2026-07-16 09:00 UTC
End Time: 2026-07-16 10:00 UTC
Impact: REST Traffic – EU. During the maintenance window, clients making GET requests may experience intermittent service interruptions, increased response times, or temporary request failures due to the database upgrade activities.
We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled, we will advise you accordingly.
Please contact support@sinch.com should you require further information or assistance.
Posted on Jun 15, 2026 - 15:35 UTC
Type: Maintenance – REST Traffic Database Upgrade
Start Time: 2026-07-16 09:00 UTC
End Time: 2026-07-16 10:00 UTC
Impact: REST Traffic – EU. During the maintenance window, clients making GET requests may experience intermittent service interruptions, increased response times, or temporary request failures due to the database upgrade activities.
We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled, we will advise you accordingly.
Please contact support@sinch.com should you require further information or assistance.
Posted on Jun 15, 2026 - 15:35 UTC
Sinch Scheduled Maintenance - Elastic SIP Trunking / Voice API - Routing Engine Jul 16, 2026 12:30-13:30 UTC
Sinch Elastic SIP Trunking and Voice API will be undergoing maintenance to update our routing engine - the scheduled work is not expected to impact services. This is being sent as a courtesy notice in the event that you experience issues with your service during the maintenance window.
We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled we will advise you accordingly. Please contact support@sinch.com for further information.
Posted on Jul 08, 2026 - 21:34 UTC
We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled we will advise you accordingly. Please contact support@sinch.com for further information.
Posted on Jul 08, 2026 - 21:34 UTC
Emergency Maintenance - SSL Certificate Renewal - *.clxcommunications.com Jul 17, 2026 06:00-08:00 UTC
Sinch will be performing emergency maintenance to renew the SSL certificate for *.clxcommunications.com
Type: Emergency Maintenance
Maintenance: SSL Certificate Renewal
Start Time: 2026-07-17 06:00 UTC
End Time: 2026-07-17 08:00 UTC
Impact: *.clxcommunications.com
We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled, we will advise you accordingly.
As part of this update, please note that the root certificates have also changed. We recommend updating the root certificates as well to ensure continued trust and smooth operation.
Download the certificate files for all the above mentioned certificates here:
Bundle: https://clxgroup.sharepoint.com/:u:/s/CLX_Support_Anonymous_link/IQDminw-x3cjTYAzsEgg1z-lAU886Q3BSS6DcNTVw37OE9g
Cert: https://clxgroup.sharepoint.com/:u:/s/CLX_Support_Anonymous_link/IQAV1D-B14n6S7U9ejZQhSTnAVXZLz_wMvDXkf4nVgEQhFg
Posted on Jul 13, 2026 - 16:39 UTC
Type: Emergency Maintenance
Maintenance: SSL Certificate Renewal
Start Time: 2026-07-17 06:00 UTC
End Time: 2026-07-17 08:00 UTC
Impact: *.clxcommunications.com
We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled, we will advise you accordingly.
As part of this update, please note that the root certificates have also changed. We recommend updating the root certificates as well to ensure continued trust and smooth operation.
Download the certificate files for all the above mentioned certificates here:
Bundle: https://clxgroup.sharepoint.com/:u:/s/CLX_Support_Anonymous_link/IQDminw-x3cjTYAzsEgg1z-lAU886Q3BSS6DcNTVw37OE9g
Cert: https://clxgroup.sharepoint.com/:u:/s/CLX_Support_Anonymous_link/IQAV1D-B14n6S7U9ejZQhSTnAVXZLz_wMvDXkf4nVgEQhFg
Posted on Jul 13, 2026 - 16:39 UTC
Campaigns Server Maintenance Jul 20, 2026 20:00-21:00 UTC
Update -
We will be undergoing scheduled maintenance during this time.
Jun 18, 2026 - 10:03 UTC
Jun 18, 2026 - 10:03 UTC
Update -
We will be undergoing scheduled maintenance during this time.
Jun 18, 2026 - 10:03 UTC
Jun 18, 2026 - 10:03 UTC
Scheduled -
We will be performing a server maintenance.
This will impact our APIs and our sFTP Connector products in France.
A limited downtime is expected.
Jun 18, 2026 - 10:01 UTC
This will impact our APIs and our sFTP Connector products in France.
A limited downtime is expected.
Jun 18, 2026 - 10:01 UTC
Sinch Scheduled Maintenance - MMS - United States - AT&T Jul 21, 2026 04:00-06:00 UTC
Dear Client,
To improve the performance and reliability of our MMS platform, Sinch has scheduled maintenance affecting AT&T MMS connectivity. Please find the maintenance details below.
Maintenance Start time: 2026-07-21 04:00 UTC
Maintenance End time: 2026-07-21 06:00 UTC
Impact: During the maintenance window, customers may experience a loss of MMS delivery receipts. In addition, MMS MT traffic destined for AT&T devices may be delayed or fail.
We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled, we will advise you accordingly.
Please contact support@sinch.com should you require further information or assistance.
Posted on Jul 02, 2026 - 18:32 UTC
To improve the performance and reliability of our MMS platform, Sinch has scheduled maintenance affecting AT&T MMS connectivity. Please find the maintenance details below.
Maintenance Start time: 2026-07-21 04:00 UTC
Maintenance End time: 2026-07-21 06:00 UTC
Impact: During the maintenance window, customers may experience a loss of MMS delivery receipts. In addition, MMS MT traffic destined for AT&T devices may be delayed or fail.
We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled, we will advise you accordingly.
Please contact support@sinch.com should you require further information or assistance.
Posted on Jul 02, 2026 - 18:32 UTC
Services | Operator Services | Application, Network or System Maintenance | PCR Number #PCRSDI-12304 Jul 21, 2026 16:00-17:00 UTC
Services :: DI SMS 365
PCR Number :: PCRSDI-12304
Start Date and Time (GMT):: 7/21/2026 16:00
End Date and Time (GMT):: 7/21/2026 17:00
Impact
Mobile Terminating (MT) Traffic: Potential Impact.
Mobile Originated (MO) Traffic: Potential Impact.
DR Notification: Potential Impact.
Description:
Sinch Digital Interconnect has scheduled a planned maintenance to carry out activities on the internal applications.
If you experience any issues during this maintenance , please contact the Operator Service NOC immediately at operatorservices.noc@sinch.com or +1 470.300.8394 (select ‘Support’ from the menu, option 2 for Digital Interconnect and then option 1) and reference this notification.
Posted on Jul 10, 2026 - 18:49 UTC
PCR Number :: PCRSDI-12304
Start Date and Time (GMT):: 7/21/2026 16:00
End Date and Time (GMT):: 7/21/2026 17:00
Impact
Mobile Terminating (MT) Traffic: Potential Impact.
Mobile Originated (MO) Traffic: Potential Impact.
DR Notification: Potential Impact.
Description:
Sinch Digital Interconnect has scheduled a planned maintenance to carry out activities on the internal applications.
If you experience any issues during this maintenance , please contact the Operator Service NOC immediately at operatorservices.noc@sinch.com or +1 470.300.8394 (select ‘Support’ from the menu, option 2 for Digital Interconnect and then option 1) and reference this notification.
Posted on Jul 10, 2026 - 18:49 UTC
External Maintenance - Toll-Free Number Provider (US and CA) Jul 23, 2026 03:00-07:00 UTC
We are writing to inform you that our Toll-Free Number Provider (US and CA) will be performing planned maintenance at the times specified below:
Start Time: 2026-07-23 03:00 UTC
End Time: 2026-07-23 07:00 UTC
Impact SMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States and Canada.
Impact MMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States.
Posted on Jun 02, 2026 - 01:30 UTC
Start Time: 2026-07-23 03:00 UTC
End Time: 2026-07-23 07:00 UTC
Impact SMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States and Canada.
Impact MMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States.
Posted on Jun 02, 2026 - 01:30 UTC
External Maintenance - Toll-Free Number Provider (US and CA) Jul 30, 2026 03:00-07:00 UTC
We are writing to inform you that our Toll-Free Number Provider (US and CA) will be performing planned maintenance at the times specified below:
Start Time: 2026-07-30 03:00 UTC
End Time: 2026-07-30 07:00 UTC
Impact SMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States and Canada.
Impact MMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States.
Posted on Jun 02, 2026 - 01:49 UTC
Start Time: 2026-07-30 03:00 UTC
End Time: 2026-07-30 07:00 UTC
Impact SMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States and Canada.
Impact MMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States.
Posted on Jun 02, 2026 - 01:49 UTC
Service Announcement & Maintenance: New SMSC Site & Whitelisting Requirements - US Region Oct 1, 2026 07:00-08:00 UTC
As part of our commitment to platform reliability, security, and scalability, Sinch is adding a brand-new, high-efficiency site to our core SMSC billing and messaging routing engine product. This site expansion introduces a next-generation, high-performance architecture to significantly increase our regional capacity, improve overall platform stability, and ensure robust message processing.
New Regional Connection Endpoints that are planned to go live 2026-10-01 during the target window:
US SMPP: us6.smpp.api.sinch.com:
US HTTP SMS: us6.httpsms.api.sinch.com
US Lookup API: us6.httplookup.api.sinch.com
Type: Service Announcement & Maintenance
Maintenance start time: 2026-10-01 07:00 UTC
Maintenance end time: 2026-10-01 08:00 UTC
Action Required: Firewall Whitelisting
To ensure uninterrupted message delivery as we scale our traffic to include this new site we request that you update your firewall settings.
Affected API Endpoint:
(This change only affects customers connecting to either of the following US endpoints)
US SMPP: us1.smpp.api.sinch.com and/or us7.smpp.api.sinch.com
US HTTP SMS: us1.httpsms.api.sinch.com and/or us7.httpsms.api.sinch.com
US Lookup API: us1.httplookup.api.sinch.com and/or us7.httplookup.api.sinch.com
IP Addresses to Whitelist
Please coordinate with your network security team to whitelist these target IP addresses:
35.95.194.74
44.239.11.143
52.32.122.205
If for any reason the maintenance is extended, cancelled, or postponed, we will advise you accordingly.
Please contact support@sinch.com should you require further information or assistance.
Posted on Jul 10, 2026 - 08:37 UTC
New Regional Connection Endpoints that are planned to go live 2026-10-01 during the target window:
US SMPP: us6.smpp.api.sinch.com:
US HTTP SMS: us6.httpsms.api.sinch.com
US Lookup API: us6.httplookup.api.sinch.com
Type: Service Announcement & Maintenance
Maintenance start time: 2026-10-01 07:00 UTC
Maintenance end time: 2026-10-01 08:00 UTC
Action Required: Firewall Whitelisting
To ensure uninterrupted message delivery as we scale our traffic to include this new site we request that you update your firewall settings.
Affected API Endpoint:
(This change only affects customers connecting to either of the following US endpoints)
US SMPP: us1.smpp.api.sinch.com and/or us7.smpp.api.sinch.com
US HTTP SMS: us1.httpsms.api.sinch.com and/or us7.httpsms.api.sinch.com
US Lookup API: us1.httplookup.api.sinch.com and/or us7.httplookup.api.sinch.com
IP Addresses to Whitelist
Please coordinate with your network security team to whitelist these target IP addresses:
35.95.194.74
44.239.11.143
52.32.122.205
If for any reason the maintenance is extended, cancelled, or postponed, we will advise you accordingly.
Please contact support@sinch.com should you require further information or assistance.
Posted on Jul 10, 2026 - 08:37 UTC