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// Call this number to inspect your SIP headers
Malaysian DID · Works from any SIP client, PBX, or mobile · Results appear below
Call nowVia, Contact, User-Agent, and Route are stripped by Twilio's SBC and are not available. Annotated values reflect what your system actually presented to the network.
Via, Contact, User-Agent, Route, Record-Route, Max-Forwards, Allow, Supported, and Content-Type are stripped by Twilio's Session Border Controller before the webhook is fired. This is standard behaviour for any CPaaS provider. To inspect raw SIP, use a SIP packet capture (e.g. Wireshark, sngrep) on your own network.