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VCS Control - mgcp gateway interworking issue


I have a problem when voice calls from ISDN PRI are routed to VCS Control and it ends the media, therefore traversal call is established.

The call path is this:

ISDN PRI --> 2821 mgco gateway (15.1) --> CUCM7.1 --> Trunk SIP --> VCS Control --> MCU registered on VCS expressway

The problem is that ISDN caller, got only noise on his phone.

When I take a look at the call stablished on the gateway, I have seen that the negotiated codec is G.728:

    962654 ORG     T25    g728        VOIP        P      [VCS Control IP]:51890
    962653 ORG     T25    g728        TELE        P

6. S1/DS1-0/11  C=D000000002888c7c000000F5800004ff,962653,962654  I=0x7492A  P=18084,51890  M=3  S=4,4 CO=10 E=2,0,1,2  R=0,0 K=0 COM=

The SIP Trunk are in only G711 region in spite of this, router negotiated G.728 with VCS Control.

The MGCP configuration is this:

MGCP Admin State ACTIVE, Oper State ACTIVE - Cause Code NONE
MGCP call-agent: 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 cisco
MGCP dtmf-relay for voAAL2 is SDP controlled
MGCP voip modem passthrough 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: 5
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 DISABLED
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: trunk-package
MGCP supported packages: gm-package dtmf-package trunk-package line-package
                         hs-package atm-package ms-package dt-package mo-package
                         res-package mt-package fxr-package srtp-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: ENABLED
MGCP Fax relay ANSam suppression: DISABLED
MGCP control bound to interface GigabitEthernet0/0
MGCP media bound to interface GigabitEthernet0/0
MGCP Upspeed payload type for G711ulaw: 0,  G711alaw: 8
MGCP Dynamic payload type for Cisco fax indication: 96, Cisco fax ack: 97
MGCP Dynamic 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 g729 variants use static payload type and contain annexb in SDP
MGCP Guaranteed scheduler time is DISABLED
MGCP Disconnect delay error recovery DISABLED
MGCP support for a:crypto RFC notation is DISABLED
MGCP DNS stale threshold is 30 seconds

Anyone have ideas of what is happening?


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