FAQ/How can the phone look up potential numbers to dial on a remote server
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Answer
Yes, via SIP PUBLISH messages. When the digits/characters to dial are being typed in, the phone sends a PUBLISH request to the proxy. Assume we have typed in "1" and "0":
PUBLISH sip:101@192.168.0.1:5060 SIP/2.0 ... CSeq: 1 PUBLISH ... Event: number-guessing ... Number: 10 Max-Hits: 3
The proxy sends back three alternatives attached to the reply:
SIP/2.0 200 Ok ... CSeq: 1 PUBLISH c: application/number-guessing l: 136 "Franky Chang" sip:101@192.168.0.1;user=phone "Steven Jones" sip:102@192.168.0.1;user=phone "Marie Sun" sip:103@192.168.0.1;user=phone
