[cisco-voip] SIP Trunk from ISP DTMF issue

[Nick Matthews]

Also check the ccn subsystem sip on the CUE - make sure you're
configured for the DTMF method you're using everywhere else.  Plus use
a CUBE as stated.

-nick

On Tue, Jul 13, 2010 at 11:17 AM, Mark Holloway <mh at markholloway.com> wrote:
> The Genband is probably doing the same thing that CUBE would be doing.  What
> are the DTMF requirements from your provider?  Have you confirmed that DTMF
> is being passed to the provider?  A Wireshark capture on the public side of
> the S3 would verify DTMF is being passed.
> On Jul 13, 2010, at 7:58 AM, Bill wrote:
>
> You should not trunk directly to CUCM from your ITSP. You need to go through
> a CUBE router. Terminate the ITSP on the CUBE and then do a SIP trunk to
> your CUBE router.
>
> ________________________________
> From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On
> Behalf Of Paul van den IJssel
> Sent: Tuesday, July 13, 2010 9:54 AM
> To: cisco-voip at puck.nether.net
> Subject: [cisco-voip] SIP Trunk from ISP DTMF issue
>
> Hi all,
>
> Currently I'm running a acceptance test on a SIP Trunk from our ISP.
> Everything is working fine except the DTMF.
>
> Setup:
> [GenBand SBC] ---- [SIP Trunk into CUCM 7.1] ---- [Cisco Unity Express 7.0]
>
> The SIP Trunk as well as the CUE are in the same region supporting only
> G.711. On the SIP Trunk I've tried all different kind of DTMF configurations
> (No Preference, RFC 2833 and OOB). We've tried to force the GenBand SBC to
> only use RFC 2833 as well as the SIP Trunk. But this didn't work, not even
> after we added a MRGL with MTP's.
>
> Is there some sort of best practive to implement DTMF over a SIP Trunk? Is
> there a way I can do some debugging on the CUCM/CUE?
>
> Kind regards,
>
> Paul van den IJssel
> Digacom
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