<div dir="ltr"><div><div>Here are my two cents. <br></div><div><br>Skinny endpoint mostly do an delayed offer, unless we force on sip trunk to do an an early offer ( mtp if needed ). as everyone said, ringback behavior changes from call manager, as per what we get from called party. <br>
<br></div>180 ringing without SDP - > Ringback needs to be generated locally. <br></div>180 / 183 with SDP - > Called party is going to play ringback for us. We just need to establish media by that time ( Similar to what we see in ISDN, when we get alerting with an PI of 3 or 8 ). In case of delayed offer, PRACK is really an solution to look forward to have media established beforehand. <br>
<br><br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jun 3, 2014 at 10:50 PM, Brian Meade <span dir="ltr"><<a href="mailto:bmeade90@vt.edu" target="_blank">bmeade90@vt.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Definitely at least need the "debug ccsip messages" for one of the calls. We'll need to see if AT&T is sending a 180 Ringing or if they're sending a 183 Session Progress w/ SDP to play the ringback inband. If they're sending a 183 Session Progress, make sure the SIP Profile on the SIP Trunk has the Rel1XX Options set to Send Prack if 18X contains SDP.</div>
<div class="gmail_extra"><br><br><div class="gmail_quote"><div><div class="h5">On Tue, Jun 3, 2014 at 12:43 PM, Matthew Loraditch <span dir="ltr"><<a href="mailto:MLoraditch@heliontechnologies.com" target="_blank">MLoraditch@heliontechnologies.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
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<p class="MsoNormal">We are having a regular but not always issue with a client, where they are not hearing the ringing when dialing outbound on calls. These are SCCP 6945s to UCM 9.1.2 SIP Trunked to CUBE and then handoff to at&t’s ipFlex service.<u></u><u></u></p>
<p class="MsoNormal">If anyone has some suggestions to look at before I spend time with TAC it would be appreciated!<u></u><u></u></p>
<p class="MsoNormal">Thanks!<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Matthew G. Loraditch – CCNP-Voice, CCNA-R&S, CCDA<u></u><u></u></p>
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