[cisco-voip] No Ringing on Some outbound Calls - at&t ipFlex

[Amit Kumar]

Here are my two cents.

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.

180 ringing without SDP - > Ringback needs to be generated locally.
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.




On Tue, Jun 3, 2014 at 10:50 PM, Brian Meade <bmeade90 at vt.edu> wrote:

> 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.
>
>
> On Tue, Jun 3, 2014 at 12:43 PM, Matthew Loraditch <
> MLoraditch at heliontechnologies.com> wrote:
>
>>  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.
>>
>> If anyone has some suggestions to look at before I spend time with TAC it
>> would be appreciated!
>>
>> Thanks!
>>
>>
>>
>>
>>
>> Matthew G. Loraditch – CCNP-Voice, CCNA-R&S, CCDA
>>
>> 1965 Greenspring Drive
>> Timonium, MD 21093
>>
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>>
>>
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