[cisco-voip] MGCP Transfer issue

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Hi All
 
We have two MGCP gateways GW1 with 1  E1 end point and GW2 with 2 E1 en points, inbound calls come in over 0/1/0 on GW2, if they are  transferred off-net then calls going out of 0/0/0 or 0/1/0 on GW1 work fine, however if the transferred call goes out of 0/0/0 on GW1 then we get one way audio for the transferred call.
 
Calls going out of GW1 0/0/0 are fine in normal circumstances.
 
2911 gateways with 15.1.4M4, all are configured the same settings.
 
Any ideas?
 
Regards
 
Nick

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