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No ringback when placing Avaya to CCM calls

Unanswered Question

I have an Avaya TDM phone installation that is integrated to an IPT CallManager network via T1-CAS MGCP gateway. When calls are initiated from IPT network to Avaya network, ringbacks are heard on IPT phones. However, when placing a call from the Avaya TDM phones into the CallManager IPT network, no ringbacks are heard (IPT phone rungs and calls proceed successfully). Below is my gateway config:


!

controller T1 0/0/0

framing esf

linecode b8zs

ds0-group 1 timeslots 1-24 type e&m wink-start

!

!

mgcp

mgcp call-agent 10.164.117.199 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

no mgcp explicit hookstate

mgcp rtp payload-type g726r16 static

!

mgcp profile default

!

!

!

dial-peer voice 999000199 pots

service mgcpapp

port 0/0/0:1


-----------------------------------

SAMPLE CallManager Gateway config:

MGCP T1 Gateways : Qty 1


End-Point Name -- S0/SU0/[email protected]

Description -- [email protected]_GW1

Device Pool PUE_DP

Media Resource Group List None

Location None


Top

MGCP Analog FXO Gateways : Qty 4


End-Point Name -- AALN/S0/SU1/[email protected]

Gateway Information

Description AALN/S0/SU1/[email protected]-GW1

Device Pool PUE_DP

Calling Search Space None

Media Resource Group List None

Location None

Network Locale Unknown

Port Information

Port Direction Outbound

Attendant DN 9400

Product Specific Configuration

Hookflash Timer (50-1550ms)

Inter-digit Duration Timer (50-500 ms)

Input Gain (-6..14 db)

Output Attenuation (0..14 db)

Echo Cancellation Enable

Echo Cancellation Coverage (ms)


End-Point Name -- AALN/S0/SU1/[email protected]

Gateway Information

Description AALN/S0/SU1/[email protected]-GW1

Device Pool PUE_DP

Calling Search Space None

Media Resource Group List None

Location None

Network Locale Unknown

Port Information

Port Direction Bothways

Attendant DN 0

Product Specific Configuration

Hookflash Timer (50-1550ms)

Inter-digit Duration Timer (50-500 ms)

Input Gain (-6..14 db)

Output Attenuation (0..14 db)

Echo Cancellation Enable

Echo Cancellation Coverage (ms)





Any help is appreciated.


Thanks,


Mike.

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gogasca Sun, 09/10/2006 - 10:50
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I would first suggest addedd the two following commands:


"mgcp bind media source-interface

'mgcp bind control souce-interface


We need to verify that the gateway is sending ringback to the PBX now.

Would you capture a:

debug vtsp all

debug vtsp tone


while making a call from a PBX phone to a IP phone. CCM trace will be useful here, could you please send me the calling party number, the called party number, and the exact time of the call with the debug output.

Need to check the RQNT (S: G/rt) in the MGCP process.


If I remember correctly, in the Avaya side for the trunk group type Which one you have: ?Tandem? or ?Tie?.

In the Trunk group parameters in & out signaling: ?WINK/WINK? vs ?WINK/DELAY? ?



Let us know.

I ended up opening a TAC case on this and thought I would pass on the resolution. An MGCP packet debug indicated that the Avaya PBX was sending an extra digit. Although Avaya integration documents on CCO suggested the Avaya trunk be set to "tandem", the TAC engineer found a previous case with similar symptoms that was corrected by setting the Avaya trunk to "tie".

We had the Avaya trunk changed to "tie" and that cured the problem!

Thanks for your reply and time on this.

Mike.

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