Source note · DNS SRV and service discovery for SIP
Twilio publishes NAPTR and SRV records on the generic localized edge names pstn.[edge].twilio.com (for example pstn.ashburn.twilio.com), which resolve to the same IPs as a customer's personal localized trunk domain.
Checked 2026-09-24
supported SIP servers can query the SRV record for additional load balancing information
- Vendor
- Twilio
- Product
- Elastic SIP Trunking
- Subsystem
- termination addressing
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- Sending SIP to Twilio - Best Practices — Twilio · tier 2 current vendor documentation · Localized termination URI and SRV/NAPTR records section
Cite this note
APA
WarmTransfer. (2026, September 24). DNS SRV and service discovery for SIP: source note dns-srv-voice-twilio-edge-srv-naptr. WarmTransfer. https://warmtransfer.net/knowledge/claims/dns-srv-voice-twilio-edge-srv-naptr
BibTeX
@misc{warmtransfer-claim-dns-srv-voice-twilio-edge-srv-naptr,
title = {DNS SRV and service discovery for SIP: source note dns-srv-voice-twilio-edge-srv-naptr},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/dns-srv-voice-twilio-edge-srv-naptr},
note = {Source note dns-srv-voice-twilio-edge-srv-naptr, checked 2026-09-24}
}