SIP OPTIONS pings are widely used as a heartbeat mechanism in SIP Communications networks. You can have your Communications Infrastructure issue SIP OPTIONS messages as a ping mechanism to Twilio’s Elastic SIP Trunk (Send the Message Request To: Outbound SIP Trunk URI you created (example.pstn.twilio.com)); the Twilio platform will respond appropriately.
Sending SIP OPTIONS PING to Twilio Elastic SIP Trunk
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