Normally, the REGISTER and PUBLISH are sent separately. In our solution, it is not needed, we should send only a „single” REGISTER with some „publish info”. A custom SIP header (PresenceInReg) is defined in REGISTER which contains the presence information. Here is an example:
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REGISTER sips:example.com:443 SIP/2.0
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Via: SIP/2.0/TLS 192.168.1.100;branch=z9hG4bK-524287-1---ec449f7fc5b0af2a;rport
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Max-Forwards: 70
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PresenceInReg: device;open;&lt;status&gt;&lt;state&gt;online&lt;/state&gt;&lt;message&gt;normal&lt;/message&gt;&lt;/status&gt;
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Contact: <sip:1111111111@192.168.1.100;transport=tls>;+sip.instance="785722228"
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To: "Andrea Máté"<sips:11111111@sip01.crypttalk.com:443>
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From: "Andrea Máté"<sips:11111111@sip01.crypttalk.com:443>;tag=f4a82829
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Call-ID: fWmDgP_8wJvQAKTM_b4ajw..
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CSeq: 27 REGISTER
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Expires: 800
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Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, UPDATE, INFO, MESSAGE, REFER, NOTIFY, SUBSCRIBE, REGISTER
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Supported: norefersub, replaces, eventlist
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User-Agent: Example_UA
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Authorization: Digest username="1975539839",realm="example.com",nonce="VWwOB1VsDNsw7TW7jHJhrpX40TfhJA7t",uri="sips:example.com:443",response="78ab5f7a36c8ddae6f69c5262e240d8b",algorithm=MD5
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X-CT-PushInfo: I;iNRvcCqBGqLeprCFaA7P+jrNwg2q+VYZ20FPw3Rv5hU=;hu;Ringing-Ringtone_long.wav,im.wav,ct_autoreject.wav
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Content-Length: 0
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<br>
Peter
<br>
From: Daniel-Constantin Mierla [mailto:notifications@github.com]
<br>
Sent: Monday, June 1, 2015 10:13 AM
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To: kamailio/kamailio
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Cc: Péter Barabás
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Subject: Re: [kamailio] Adding publish in registration functionality, sending "closed" NOTIFY when presense has expired (#177)
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<br>
What do you mean by "a single but extended REGISTER request"? Can you give an example of such REGISTER request?
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—
<br>
Reply to this email directly or view it on GitHub<https://github.com/kamailio/kamailio/pull/177#issuecomment-107355252>.
<br>


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