[cisco-voip] DTMF and MGCP gateway

[Bill Riley III]

I was using dtmf-relay h245-alphanumeric with the H.323 gateway. The
ATA's are using SCCP. 

 

________________________________

From: Wes Sisk [mailto:wsisk at cisco.com] 
Sent: Monday, February 27, 2006 11:13 AM
To: Bill Riley III
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] DTMF and MGCP gateway

 

with this command:
mgcp dtmf-relay voip codec all mode out-of-band

the router is using the same DSP commands to recognize inband tones and
take them out of band so long as h323 was also configured to use
dtmf-relay h245-alphanumeric.  If you were not using dtmf-relay under
h323, your signaling would have remained inband (in the audio channel).

With out of band relay, are your ATA's using sccp or h323? If SCCP, SCCP
only provides for a DTMF, and not a duration.  With h323 gateways if you
use h245-signal, you get DTMF relayed OOB with both a digit and a
duration.  There is a CCM service parameter to modify digit duration for
h323 with h245-signal DTMF relay is used.  

/Wes

Bill Riley III wrote: 

 

 

I have a 2851 with a PRI into a MFT card for connectivity to the PSTN. I
also have an IVR system used for a telephone banking application. The
customer calls a pilot number associated with the PRI and it gets
translated to an internal hunt group. There are four DN's in the hunt
group connected to ATA's which terminate into the IVR system. Everything
was working fine until the gateway was converted from H.323 to MGCP in
order to facilitate a request by the customer. Now we are getting
complaints that the IVR system is not understanding certain digits the
when the customer is trying to input their account number. I have this
same ATA to the IVR system setup running at a few other customers using
H.323 with no problems and we did not have any complaints until the
switch to MGCP.  I have not been able to track down if it is specific
digits but the problem seems sporadic, some times the customer gets in
and sometimes they do not. Here are some sections of the router config.
I am running CCM 4.1.3. Any help would be appreciated. 

 

 

network-clock-participate wic 1 

network-clock-select 1 T1 0/1/0

ip subnet-zero

no ip source-route

 

voice class codec 100

 codec preference 1 g711ulaw

 codec preference 2 g729r8

!

!

!

voice class h323 100

 h225 timeout tcp establish 3

!

!

!

voice class dualtone-detect-params 90

 freq-max-power 6

 freq-min-power 25

 freq-power-twist 15

 freq-max-delay 16

 cadence-variation 8

!

controller T1 0/1/0

 framing esf

 linecode b8zs

 pri-group timeslots 1-24 service mgcp

!

interface Serial0/1/0:23

 no ip address

 isdn switch-type primary-ni

 isdn incoming-voice voice

 isdn bind-l3 ccm-manager

 no cdp enable

 

ccm-manager redundant-host 10.10.1.10

ccm-manager mgcp

ccm-manager music-on-hold

ccm-manager config server 10.10.1.11  

ccm-manager config

!

mgcp

mgcp call-agent 10.10.1.11 2427 service-type mgcp version 0.1

mgcp dtmf-relay voip codec all mode out-of-band

mgcp rtp unreachable timeout 1000 action notify

mgcp modem passthrough voip mode nse

mgcp package-capability rtp-package

no mgcp package-capability res-package

mgcp package-capability sst-package

no mgcp package-capability fxr-package

mgcp package-capability pre-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax t38 inhibit

mgcp rtp payload-type g726r16 static

mgcp bind control source-interface Loopback0

mgcp bind media source-interface Loopback0

!

mgcp profile default

 

Thanks,

Bill Riley

 

 

 



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