SUBSCRIPTIONS: If you want to subscribe to updates for Elastic SIP Trunking, click the Options menu button in the right-hand-corner of this article and select Subscribe. You will then receive email notifications when this article is updated with new release notes.
Check in here to see information about new releases from Elastic SIP Trunking.
6/12/2026 - Optional "X" headers
Sinch Elastic SIP Trunks may now include optional "X" headers placed into calls from their SIP trunk. Configure this under your trunks inbound call settings. Once done, all calls to your Sinch provided numbers will have that header and value placed into them.
6/10/2026 - Preferred locations
Sinch Elastic SIP Trunks may now select a preferred location that would like calls to be sent to them from. We use geo-DNS to select our routes if no preference is set on the endpoint.
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. Read more about the code hunting behavior here.
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.
