MGCP with one way voice

Unanswered Question
Mar 18th, 2004
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I have a 2611XM running MGCP with IOS c2600-is-mz.122-13.T8.bin with CM 3.3.3sr3. There is an AIM module with the E1 going into an Ericsson MD110 PABX running QSIG. Incoming and outgoing call is OK, but there is only one way voice. Only the IP phone could hear the conversation. Portion of the config is below. Anyone run into this problem?

network-clock-participate wic 0

network-clock-select 1 E1 0/0

voice-card 0

codec complexity medium ecan-extended


ccm-manager fallback-mgcp

ccm-manager redundant-host X.X.X.X

ccm-manager mgcp

ccm-manager music-on-hold

ccm-manager config server X.X.X.X

ccm-manager config

fax interface-type fax-mail

mta receive maximum-recipients 0


controller E1 0/0

pri-group timeslots 1-31 service mgcp

description QSIG PRI to MD110 Clock from PABX clocks Router

interface Serial0/0:15

no ip address

no logging event link-status

isdn switch-type primary-qsig

isdn overlap-receiving

isdn protocol-emulate network

isdn incoming-voice modem

isdn T203 30000

isdn T310 60000

isdn bind-l3 ccm-manager

isdn bchan-number-order ascending

no cdp enable

voice-port 0/0:15

echo-cancel coverage 24

cptone AU

description "30 Channel "QSIG" link to Ericsson MD110 PABX"



mgcp call-agent 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

no mgcp package-capability res-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax t38 inhibit

mgcp rtp payload-type g726r16 static

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pbarman Thu, 03/18/2004 - 21:22
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You are having one-way voice for both incoming and outgoing calls. Check if your ip routing is ok, and the phones have the correct default gateway to reach the 2600 router.

azam_anwar Fri, 03/19/2004 - 03:47
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Hi Vinh, could you tell me the cable pin-outs you used for the connection between your router and Ericsson MD110 PABX as i have to set up the same.

Thanks for your help.

vinhnguyen Tue, 03/23/2004 - 21:55
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Unable to help you with this because it was setup originally by someone else.


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