[cisco-voip] SIP Trunk for ISP's - DTMF SIP Notify

[Bill]

Don't trunk directly to your CUCM 7.x from an ITSP, this is a design
consideration that should have been identified before deployment of the
trunk. 

 

  _____  

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, June 01, 2010 3:53 PM
To: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] SIP Trunk for ISP's - DTMF SIP Notify

 

The SIP Trunk is directly connected to the CUCM (7.X). So there is no ISR,
or CUBE in between. 

The System Guide of CUCM 7.X states that only the 7971 7975 support RFC2833.
Currently I'm running the test with 7941 and 7961 phones. Also all regions
are set to use g.711 and there is no MRGL associated to the Device Pools of
the phones and the SIP Trunk.

 

If I try setting up a call and run the RTMT tool I don't see the CUCM using
any MTP's. The SBC which is used isn't a Cisco CUBE.. but I've lost the
name, I thought it was a NextTone or something.

 

- Paul

2010/6/1 Ryan Ratliff <rratliff at cisco.com>

What phones do you have?  Most of them do in fact support RFC2833.
Additionally, using g.711 for rtp the software MTP resources on your CUCM
can convert the dtmf just fine.

Even if you are using g729 you can use a software MTP on the router acting
as your CUBE to do the necessary dtmf conversion which doesn't require any
hardware DSPs.

-Ryan


On Jun 1, 2010, at 4:34 PM, Paul van den IJssel wrote:

> Hi Guys,
>
> Currently I'm testing a SIP Trunk with our ISP. Everything is working fine
but I don't get the DTMF to work. This because my SCCP phones only support
OOB DTMF. So to get it to work with SIP RFC2833 (in-band) I need an
expensive transcoder. But now we've set the SIP Trunk to SIP Notify
(out-band) which should work with the IP Phones OOB, but all I get is
'SIP/2.0 403 Forbidden'.
>
> How do I get this to work without the use of a hardware Transcoder?
>
> Best regards,
>
> Paul van den IJssel
> Digacom

> _______________________________________________
> cisco-voip mailing list

> cisco-voip at puck.nether.net

> https://puck.nether.net/mailman/listinfo/cisco-voip

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20100601/fcafa9a3/attachment.html>