Modem fails with VG204

Unanswered Question
Mar 24th, 2010

I have a call manager v7.1 in the UK  and I have configured a VG204 to handle FAX and modem calls.  I have configured it with MGCP.  The FAX calls go through, however the modem calls connect to the other side, go through a prolonged handshake, then disconnect.  Am I missing something in the config?  Here it is:

version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
enable secret 5 $1$tHRU$jvHqBxlJlQefJWVGUnslw.
!
no aaa new-model
ip source-route
!
!
!
!
ip cef
no ip domain lookup
no ipv6 cef
!
!
!
!
!
!
voice class codec 1
codec preference 1 g711ulaw
codec preference 2 g711alaw
codec preference 3 g729r8
codec preference 4 g729br8
!
!
!
!
!
!
!
!
!
!
!
!
!
voice-card 0
!
username Administrator privilege 15 password 0 ****
archive
log config
  hidekeys
!
!
!
!
!
interface FastEthernet0/0
ip address 10.133.10.40 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 10.133.10.1
!
ip http server
!
!
!
control-plane
!
!
!
voice-port 0/0
cptone GB
!
voice-port 0/1
cptone GB
!
voice-port 0/2
cptone GB
!
voice-port 0/3
cptone GB
!
ccm-manager mgcp
no ccm-manager fax protocol cisco
ccm-manager music-on-hold
ccm-manager config server 10.133.10.10
ccm-manager config
!
mgcp
mgcp call-agent 10.133.10.10 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 modem passthrough voip codec g711alaw
mgcp package-capability rtp-package
mgcp package-capability sst-package
no mgcp package-capability res-package
no mgcp package-capability fxr-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp rtp payload-type g726r16 static
!
mgcp profile default
!
!
!
dial-peer voice 99920 pots
service mgcpapp
port 0/0
!
dial-peer voice 99921 pots
service mgcpapp
port 0/1
!
dial-peer voice 99922 pots
service mgcpapp
port 0/2
!
dial-peer voice 99923 pots
service mgcpapp
port 0/3
!
dial-peer voice 99900 pots
service mgcpapp
port 0/0
!
!
!
line con 0
no modem enable
line aux 0
line vty 0 4
password ****

login local
!
exception data-corruption buffer truncate
end

Thanks for your help.

I have this problem too.
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afmmanicke Wed, 03/24/2010 - 14:42

Below is a sinp-it from my config...

voice service voip
modem passthrough nse codec g711ulaw

Also be sure you have the same MGCP and voip sevice voip configured in your final gateway to the PSTN.   In Call Manager be sure that modem passthrough is enabled on the VG and your PSTN gateway.

Good luck!

Yogesh Singh Thu, 03/25/2010 - 08:23

Ed ,

Whats the call flow here ?

modem>>MGCP>>>CUCM---SIP/MGCP/H323---PSTN/ITSP ?

NSE based modem passthrough takes the fax traffic inband over the network

We need to make sure that this is a normal voice call at g711 no VAD .

And we might need to get rid of this command which might send the wrong PT to the terminating gateway (PSTN) in case the terminating gateway is not configured for it .

no mgcp modem passthrough voip mode nse
no mgcp modem passthrough voip  codec g711alaw

also check the output of show controller e1  .

Also please paste show controller e1 and show run output from your PSTN gateway

ed.crawford Thu, 03/25/2010 - 11:46

Outbound it goes from the modem to the VG204 which is registered with CUCM and is then sent to a 2801 with a VWIC2-1MFT-E1 using MGCP and delivered to the PSTN.

Yogesh Singh Fri, 03/26/2010 - 02:58

In this case you have to try anb disable the modem passthrough on both the originationg gateway ( vg202 ) and terminating gateway (PSTN)

Also make sure that you have both these parameters disabled on the controller page of the CUCM

If this also doesnt work

Then


following debugs will help

debug voip ccapi inout

debug voip vtsp all

debug mgcp packet

debug isdn q931( from the pstn gateway)

taken  from both the gateways . Please respond back with calling called party numbers

ed.crawford Fri, 03/26/2010 - 03:27

Here is the requested output.  On CUCM should the VG204 gateway be set to:

Modem passthrough - Enable

Cisco Fax Relay - Disable

Cisco T38 Relay - Disable

The called number is 08456017009

Thanks

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