[cisco-voip] DTMF Issue with one external number

george.hendrix at l-3com.com george.hendrix at l-3com.com
Tue Dec 11 08:07:47 EST 2012 

My TAC engineer resolved the issue by creating specific incoming dial-peers for our range of DIDs along with forcing early offer on the gateway.

Voice service voip
SIP
Early-offer forced

Along with this, he had me to enable fast start on CUCM gateway properties and I also had to make sure MTP required was checked on the gatway.

According to my TAC engineer, this configuration was the correct setup due to the fact that I am doing SIP to the provider and h323 to CUCM.  He said I would not have had the issue if I were doing SIP on both sides, or just all h323.

Regards,
Bill


From: bcchimp at gmail.com [mailto:bcchimp at gmail.com]
Sent: Monday, December 10, 2012 8:15 PM
To: Hendrix, George (Bill) @ NSS - STRATIS
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] DTMF Issue with one external number

Bill,

My TAC engineer was able to resolve the issue by registering the transcoders to the local router, not to CUCM, unchecked MTP Required, and forced the VGW to use a different codec than the carrier.  Apparently the carrier was not doing any transcoding for the customers as they should be.  Registering the transcoders locally apparently is a better "global" transcoding solution than having them registered to CUCM.

Hope this helps.

From: george.hendrix at l-3com.com<mailto:george.hendrix at l-3com.com> [mailto:george.hendrix at l-3com.com]
Sent: Friday, November 30, 2012 10:48 AM
To: bcchimp at gmail.com<mailto:bcchimp at gmail.com>
Cc: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: RE: [cisco-voip] DTMF Issue with one external number

I have not.  I have a TAC case open on this and TAC is saying it is a DTMF negotiation issue with the provider.  I had to open a new ticket with the provider because they put in the ticket that they didn't see any issues and just resolved the ticket.

-Bill


From: bcchimp at gmail.com<mailto:bcchimp at gmail.com> [mailto:bcchimp at gmail.com]
Sent: Thursday, November 29, 2012 1:40 PM
To: Hendrix, George (Bill) @ NSS - STRATIS
Cc: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: RE: [cisco-voip] DTMF Issue with one external number

Hi George,

Just wanted to check in and see if you ever got a resolution to this problem?

Thanks.

From: george.hendrix at l-3com.com<mailto:george.hendrix at l-3com.com> [mailto:george.hendrix at l-3com.com]
Sent: Monday, October 22, 2012 8:39 AM
To: Nick Matthews; Tim
Cc: Derek Wyss; cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: RE: [cisco-voip] DTMF Issue with one external number

I checked to make sure it took the command and it also showed that nte 100 was preferred. However, I was not able to navigate any menu with it set to this.  When I switched it back to the default, the other numbers that worked with the default setting started working again.

-Bill


From: matthn at gmail.com<mailto:matthn at gmail.com> [mailto:matthn at gmail.com] On Behalf Of Nick Matthews
Sent: Sunday, October 21, 2012 10:12 PM
To: Tim
Cc: Hendrix, George (Bill) @ NSS - STRATIS; Derek Wyss; cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: Re: [cisco-voip] DTMF Issue with one external number

Double check that the config took the payload type change to 100.  That's the default for NSE's and you cannot normally change the payload type value unless you change the NSE value to another value first.

Don't have a CLI in front of me, but it's similar to:
rtp payload-type nse 99
rtp payload-type nte 100

-nick
On Fri, Oct 19, 2012 at 2:43 PM, Tim <bcchimp at gmail.com<mailto:bcchimp at gmail.com>> wrote:
Yes, I have the same feeling on my side. Same problem, just one external number doesn't work.  The far end system is connected on the same carrier using SIP Trunks.  Doesn't make much sense, but from what I've been told the far end system is some sort of AdTran.

From: george.hendrix at l-3com.com<mailto:george.hendrix at l-3com.com> [mailto:george.hendrix at l-3com.com<mailto:george.hendrix at l-3com.com>]
Sent: Friday, October 19, 2012 1:35 PM
To: bcchimp at gmail.com<mailto:bcchimp at gmail.com>; 'Derek Wyss'

Cc: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: RE: [cisco-voip] DTMF Issue with one external number

Nope, still have this same issue.  Very frustrating that the issue is only to one external number and I can actually see the digits being passed out the SIP trunk.  And since it works for all other numbers, I really don't see how it could be a carrier issue on our side.

-Bill


From: bcchimp at gmail.com<mailto:bcchimp at gmail.com> [mailto:bcchimp at gmail.com]<mailto:[mailto:bcchimp at gmail.com]>
Sent: Friday, October 19, 2012 11:38 AM
To: Hendrix, George (Bill) @ NSS - STRATIS; 'Derek Wyss'
Cc: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: RE: [cisco-voip] DTMF Issue with one external number

George,

Did you ever find a fix on this? I believe I'm having a similar issue.

Thanks

From: cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of george.hendrix at l-3com.com<mailto:george.hendrix at l-3com.com>
Sent: Tuesday, October 16, 2012 9:18 PM
To: Derek Wyss
Cc: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: Re: [cisco-voip] DTMF Issue with one external number

The RTP NTE negotiated is indeed 101.  However, when I enter the commands to set it to 100, I get the following on the debug.

Preferred Codec        : g711ulaw, bytes :160
        Preferred  DTMF relay  : rtp-nte
        Preferred NTE payload  : 100
        Early Media            : No
        Delayed Media          : Yes
        Bridge Done            : No
        New Media              : No
        DSP DNLD Reqd          : No

Stream type            : voice-only
          Media line             : 1
          State                  : STREAM_ADDING (2)
          Stream address type    : 1
          Callid                 : -1
          Negotiated Codec       : g711ulaw, bytes :160
          Nego. Codec payload    : 0 (tx), 0 (rx)
          Negotiated DTMF relay  : inband-voice
          Negotiated NTE payload : 0 (tx), 0 (rx)
          Negotiated CN payload  : 0


Bill Hendrix  |  Network/VOIP Engineer
L3 STRATIS  POWERED BY EXCELLENCE

From: Derek Wyss [mailto:wyss34 at gmail.com]<mailto:[mailto:wyss34 at gmail.com]>
Sent: Tuesday, October 16, 2012 8:40 AM
To: Hendrix, George (Bill) @ NSS - STRATIS
Cc: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: Re: [cisco-voip] DTMF Issue with one external number

What does your SDP show using debug ccsip all?

I've ran into this before where the provider had a different RTP map to their IP customers vs their ISDN customers.  What I had to do was create separate dialpeers for those numbers with a different RTP map.  See example below:
v=0
o=CiscoSystemsSIP-GW-UserAgent 9601 2828 IN IP4 X.X.X.X
s=SIP Call
c=IN IP4 X.X.X.X
t=0 0
m=audio 16384 RTP/AVP 18 0 101
c=IN IP4 10.8.2.4
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=yes
a=rtpmap:0 PCMU/8000
a=rtpmap:101 X-NSE/8000
a=fmtp:101 192-194

v=0
o=Sonus_UAC 16372 5325 IN IP4 X.X.X.X
s=SIP Media Capabilities
c=IN IP4 X.X.X.X
t=0 0
m=audio 23002 RTP/AVP 18 0 100
a=rtpmap:18 G729/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:100 telephone-event/8000
a=fmtp:100 0-15
a=sendrecv
a=maxptime:20

As mentioned above the yellow highlighted portion of the SDP's is where we can see a mismatch in our payload type.  You can see the telco is sending 100 and we are sending 101.  To resolve this issue you have to remap the rtp payload type for signaling and telephony events.  Here is the commands I had to run to send 100 as our NTE to match what the provider was expecting...

Lincoln-VG01(config-dial-peer)#rtp payload-type nse 98
Lincoln-VG01(config-dial-peer)#rtp payload-type nte 100
Lincoln-VG01(config-dial-peer)#rtp payload-type nse 101

Because the signaling is defaulted at nte 101 and nse 100 you have to remove 100 from nse by assigning it a random unused value before you can assign 100 to nte.  See this image for the default reserved values: https://communities.cisco.com/servlet/JiveServlet/downloadImage/2-5295-2243/450-185/defaultpayloadtype.png

Hope this helps,

Derek

On Tue, Oct 16, 2012 at 7:25 AM, <george.hendrix at l-3com.com<mailto:george.hendrix at l-3com.com>> wrote:
Hey guys,

  We have an odd issue going on with DTMF.  Below is the path to the PSTN.

CUCM <-> h.323 Gateway <-> SIP Provider.

The problem is that when we dial into this one external number and press 1 to select option 1, it doesn't seem to accept the digit.  If we dial into that same number from anywhere else, it works fine.  Having said that, I can dial into other numbers from the system and have no issue at all with dtmf.  Any ideas of what this issue is?

Thanks,
Bill



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