Sending SIP to Twilio - Best Practices

Publisher

Twilio

URL

https://www.twilio.com/docs/sip-trunking/sending-sip-to-twilio-best-practices

Published

2026-07-21

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Twilio documentation terms; no-redistribution; short excerpts and locators only

Source notes citing this source

• 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. in context
• Twilio recommends putting the personal trunk domain in the Request-URI and setting the generic localized edge domain as the outbound proxy or Route header, so SRV and NAPTR resolution applies. in context
• Twilio states that all customer localized SIP trunk domains resolve to the same A record, so the personal domain both identifies the trunk and controls where traffic is routed. in context

Cite this source record

APA

WarmTransfer. (2026, July 21). Sending SIP to Twilio - Best Practices. WarmTransfer. https://warmtransfer.net/knowledge/sources/twilio-docs-sending-sip-best-practices

BibTeX

@misc{warmtransfer-twilio-docs-sending-sip-best-practices,
  title  = {Sending SIP to Twilio - Best Practices},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/twilio-docs-sending-sip-best-practices},
  note   = {Twilio, accessed 2026-09-24}
}