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:
<br>

<br>
REGISTER sips:example.com:443 SIP/2.0
<br>
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;&amp;lt;status&amp;gt;&amp;lt;state&amp;gt;online&amp;lt;/state&amp;gt;&amp;lt;message&amp;gt;normal&amp;lt;/message&amp;gt;&amp;lt;/status&amp;gt;
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Contact: &lt;sip:1111111111@192.168.1.100;transport=tls&gt;;+sip.instance=&quot;785722228&quot;
<br>
To: &quot;Andrea Máté&quot;&lt;sips:11111111@sip01.crypttalk.com:443&gt;
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From: &quot;Andrea Máté&quot;&lt;sips:11111111@sip01.crypttalk.com:443&gt;;tag=f4a82829
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Call-ID: fWmDgP_8wJvQAKTM_b4ajw..
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CSeq: 27 REGISTER
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Expires: 800
<br>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, UPDATE, INFO, MESSAGE, REFER, NOTIFY, SUBSCRIBE, REGISTER
<br>
Supported: norefersub, replaces, eventlist
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User-Agent: Example_UA
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Authorization: Digest username=&quot;1975539839&quot;,realm=&quot;example.com&quot;,nonce=&quot;VWwOB1VsDNsw7TW7jHJhrpX40TfhJA7t&quot;,uri=&quot;sips:example.com:443&quot;,response=&quot;78ab5f7a36c8ddae6f69c5262e240d8b&quot;,algorithm=MD5
<br>
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>

<br>
Peter
<br>
From: Daniel-Constantin Mierla [mailto:notifications@github.com]
<br>
Sent: Monday, June 1, 2015 10:13 AM
<br>
To: kamailio/kamailio
<br>
Cc: Péter Barabás
<br>
Subject: Re: [kamailio] Adding publish in registration functionality, sending &quot;closed&quot; NOTIFY when presense has expired (#177)
<br>

<br>

<br>
What do you mean by &quot;a single but extended REGISTER request&quot;? Can you give an example of such REGISTER request?
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<br>
—
<br>
Reply to this email directly or view it on GitHub&lt;https://github.com/kamailio/kamailio/pull/177#issuecomment-107355252&gt;.
<br>


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