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5/27/2026 - Change to hunting SIP rejection codes
The Sinch Elastic SIP Trunking product hunts through endpoints in order of priority whenever the customer’s infrastructure rejects, or fails to respond to, a SIP Invite request. Currently, the platform hunts on most SIP rejection codes. The maintenance on May 27, 2026 will narrow the hunting functionality to be better in line with industry norms. After the maintenance we will hunt based on the SIP code that we receive.
3/20/2026 - SIP REFER Support
Sinch Elastic SIP Trunking customers may now send SIP Refer messages from their endpoints after a call has been established. More information on how to use SIP Refer can be found here. https://community.sinch.com/t5/Elastic-SIP-Trunking/How-do-I-use-SIP-REFER/ta-p/19346
1/14/2026 - PIDF-LO Support
Sinch Elastic SIP Trunking customers may now send Presence Information Data Format – Location Object (PIDF-LO) information when making a call to 911 Emergency Services. This information is passed along to the 911 operator to provide more precise information as to the callers location.
