<pre>I don't expect my SIP provider to provide useful "Remote-Party-ID" information.<br />
Therefore, I am using "CONNECTEDLINE(num)=xxx" AND "CONNECTEDLINE(name)=yyy" to populate remote party information from a local database.<br />
I am also using the "I" (upper case "i") option for Dial.<br />
Generally I like to see to see the remote party name appear on the phone's display as soon as a call is dialed... even if the the remote party is BUSY.<br />
<br />
I ran into a problem where the Remote-Party-ID does not get displayed on the caller's phone until the remote phone is answered.<br />
I finally tracked this down to several things:<br />
a) My SIP provider sends "183 Session Progress" and inband ringback prior to sending a "180 Ringing".<br />
b) The default sip.conf file that ships with asterisk suggests using "progressinband=no" for polycom phones.<br />
c) The "progessinband=no" setting prevents the "180 Ringing" from being forwarded to the phone if it is received after the "183 Session Progress".<br />
d) Called-Parity-ID appears to be only sent to the phone with "180 Ringing" and "200 OK" responses.<br />
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<br />
# this the sequence of events that transpire:<br />
-caller places call<br />
-asterisk receives "183 Trying" from SIP provider and forwards it to the caller's phone<br />
-asterisk receives inband ringback from SIP provider and forwards it to the phone (RTP)<br />
-asterisk receives "180 Ringing" from SIP provider but does "not" forward it to the phone.<br />
-asterisk continues to receive more inband ringback from SIP provider and it continues to forward it to the phone (RTP)<br />
-remote party answers the phone<br />
-asterisk receives "200 OK" from SIP provider; asterisk inserts "Called-Party-ID" and then forwards it to the calling phone.<br />
-the display on the caller's phone is finally updated; ringback stops and someone at the other end says "hello".<br />
<br />
<br />
There are two workarounds which will make the Called-Party-ID show up on the phone before the call is answered:<br />
i) Use "progressinband=never" even though the default sip.conf file recommends against it.<br />
The recommendation is presumably based on some old bugs in the Polycom phones that no longer exists.<br />
I am using recent Polycom firmware and did not notice any bugs.<br />
Note however that the the display on the phone won't be updated if the remote phone is "BUSY", which in my case is not ideal.<br />
<br />
ii) Use the "r" option to "Dial". e.g. Dial(SIP/${EXTEN}@xxxxx,300,Ir);<br />
This has the advantage of updating the phone very quickly without waiting for any respones from the SIP provider.<br />
This may have side effects: ringback could hypothetically be produced when it shouldn't be.<br />
<br />
Questions:<br />
Is there a reason why "Remote-Party-ID" is not sent to the phone as part of the "183 Trying" message?<br />
Could this be a configurable option?<br />
<br />
Should the example sip.conf file continue to recommend "progressinband=no" for Polycom phones?<br />
<br />
-crjw<br />
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