[cisco-voip] CUCM 6.1.1 MGCP QSIG to HiPath 4000

[gweissenfels at gmx.de]

Hello Team,

following Topology:

CUCM6.1.1------ISR-GW-E1---(MGCP QSIG)----PBX Siemens HiPath4000------PSTN

We build a QSIG connection from a CUCM 6.1.1 environment to a Siemens HiPath 4000 via an 2811 ISR and an E1 interface. The gatewayprotocol is MGCP.

If we do a call from an IP Phone to the old PBX world, the phone of the called party rings and the calling name is displayed. Answering the call, we only got oneway audio (rtp). The called party in the PBX world is able to hear the calling party, but not vice versa.

Any ideas?

Thanks in advance!
Gregor