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New Member

Problem with MGCP T38 FAX Config

Is there anything wrong with this config:?

ccm-manager fallback-mgcp

ccm-manager redundant-host

ccm-manager mgcp

no ccm-manager fax protocol cisco

ccm-manager music-on-hold

ccm-manager config server

ccm-manager config



mgcp call-agent 2427 service-type mgcp version 0.1

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

mgcp modem passthrough voip mode nse

mgcp package-capability rtp-package

mgcp package-capability sst-package

mgcp package-capability pre-package

mgcp default-package mt-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax t38 ecm

no mgcp fax-relay sg3-to-g3

mgcp rtp payload-type g726r16 static

mgcp bind control source-interface GigabitEthernet0/1

mgcp bind media source-interface GigabitEthernet0/1


mgcp profile default


New Member

Re: Problem with MGCP T38 FAX Config

cay-rtr-vpn-01#sho mgcp

MGCP Admin State ACTIVE, Oper State ACTIVE - Cause Code NONE

MGCP call-agent: 2427 Initial protocol service is MGCP 0.1

MGCP validate call-agent source-ipaddr DISABLED

MGCP validate domain name DISABLED

MGCP block-newcalls DISABLED

MGCP send SGCP RSIP: forced/restart/graceful/disconnected DISABLED

MGCP quarantine mode discard/step

MGCP quarantine of persistent events is ENABLED

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

MGCP dtmf-relay for voAAL2 is SDP controlled

MGCP voip modem passthrough mode: NSE, codec: g711ulaw, redundancy: DISABLED,

MGCP voaal2 modem passthrough disabled

MGCP voip modem relay: Disabled

MGCP T.38 Named Signalling Event (NSE) response timer: 200

MGCP Network (IP/AAL2) Continuity Test timer: 200

MGCP 'RTP stream loss' timer disabled

MGCP request timeout 500

MGCP maximum exponential request timeout 4000

MGCP gateway port: 2427, MGCP maximum waiting delay 3000

MGCP restart delay 0, MGCP vad DISABLED


MGCP system resource check DISABLED

MGCP xpc-codec: DISABLED, MGCP persistent hookflash: DISABLED

MGCP persistent offhook: ENABLED, MGCP persistent onhook: DISABLED

MGCP piggyback msg ENABLED, MGCP endpoint offset DISABLED

MGCP simple-sdp ENABLED

MGCP undotted-notation DISABLED

MGCP codec type g711ulaw, MGCP packetization period 20

MGCP JB threshold lwm 30, MGCP JB threshold hwm 150

MGCP LAT threshold lwm 150, MGCP LAT threshold hwm 300

MGCP PL threshold lwm 1000, MGCP PL threshold hwm 10000

MGCP CL threshold lwm 1000, MGCP CL threshold hwm 10000

MGCP playout mode is adaptive 60, 40, 1000 in msec

MGCP Fax Playout Buffer is 300 in msec

MGCP media (RTP) dscp: ef, MGCP signaling dscp: af31

MGCP default package: mt-package

MGCP supported packages: gm-package dtmf-package trunk-package line-package

hs-package rtp-package atm-package ms-package dt-package

mo-package res-package mt-package sst-package fxr-package

pre-package md-package

MGCP Digit Map matching order: shortest match

SGCP Digit Map matching order: always left-to-right

MGCP VoAAL2 ignore-lco-codec DISABLED

MGCP T.38 Max Fax Rate is DEFAULT



MGCP T.38 Fax NSF Override is DISABLED

MGCP T.38 Fax Low Speed Redundancy: 0

MGCP T.38 Fax High Speed Redundancy: 0

MGCP Fax relay SG3-to-G3: DISABLED

MGCP Fax relay ANSam suppression: DISABLED

MGCP control bound to interface GigabitEthernet0/1

MGCP media bound to interface GigabitEthernet0/1

MGCP Upspeed payload type for G711ulaw: 0, G711alaw: 8

MGCP Dynamic payload type for Cisco fax indication: 96, Cisco fax ack: 97

MGCP Static payload type for G.726-16K codec

MGCP Dynamic payload type for G.726-24K codec

MGCP Dynamic payload type for G.726-32K codec

MGCP Dynamic payload type for G.Clear codec

MGCP Dynamic payload type for NSE is 100

MGCP Dynamic payload type for NTE is 99

MGCP rsip-range is enabled for TGCP only.

MGCP Comedia role is NONE

MGCP Comedia check media source is DISABLED

MGCP Comedia SDP force is DISABLED

MGCP Guaranteed scheduler time is DISABLED

MGCP Disconnect delay error recovery DISABLED

MGCP DNS stale threshold is 30 seconds


New Member

Re: Problem with MGCP T38 FAX Config

If looks like the Fax server do not receive the whole dialed number, making the Fax server unable to know where to point the call to.

Re: Problem with MGCP T38 FAX Config

You need these commands:

mgcp package fxr-package

mgcp default-package fxr-package



New Member

Re: Problem with MGCP T38 FAX Config

Hi guys,

I also have a similar config with 2 vg 224 behind the routers. My problem is that I receive only half a page, no matter how many I transmit.

I put the two commandsin but they did not

solve the problem.

Does anyone know why this is happening?

I run CM7 with 12.4(24)T on the rouuters.

New Member

Re: Problem with MGCP T38 FAX Config

Hi Ron, open a new conversation and I will give you the answer so I can count up some NetPro Points.

Many Thanks,


New Member

Re: Problem with MGCP T38 FAX Config

I just added a conversation with the name: Mgcp fax relay problem.

Thank you.