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

[Brian Meade]

Correct, it's the PortReq SCCP message and PortRes return message that is
used for this.


On Tue, Jun 3, 2014 at 3:22 PM, Peter Slow <peter.slow at gmail.com> wrote:

> most skinny endpoints running newish software support early offer
> using the sccp getport message, fyi.
>
> On Tue, Jun 3, 2014 at 2:10 PM, Amit Kumar <amit3.kum at gmail.com> wrote:
> > 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
> >>>
> >>> direct voice. 443.541.1518
> >>> fax.  410.252.9284
> >>>
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> >>>
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> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
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> >>
> >>
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