Mediant 1000 VoIP Gateway and Avaya, ISDN transfer

[pined12]

Hello,

I have the following scenario:

VoIP IVR connected using Ethernet to AudioCodes Mediant 1000B VoIP gateway.
Avaya connected to public PSTN using primary trunk E1 EURO ISDN (with DS1 interface card)
Avaya connected to AudioCodes Mediant 1000 VoIP gateway using another primary trunk E1 (with another DS1 interface card)
Agent stations connected to Avaya.

When a call arrives, coming from PSTN, Avaya transfers it to the VoIP IVR using the Mediant VoIP Gateway. When the IVR finalizes the processing of the call, transfers it to a VDN in the Avaya (using SIP REFER) .

The problem is: When IVR transfers the call to the VDN in Avaya, two ISDN channels remains established in the Mediant VoIP gateway.

The ISDN trunk, between Mediant VoIP Gateway and Avaya, is configured as E1 EURO ISDN (Mediant VoIP Gateway as User side). I have tried with "Network call redirection" as "explicit-etsi-ect" and "implicit-etsi-ect" (in the Avaya trunk-group configuration), but the two channels remains established.

Does any one know which is the correct configuration to get no ISDN channels busy, in the Mediant VoIP Gateway, when the transfer is completed?

[keyura]

Not Supported

Communication Manager does not support ECT or any of the NCR features on the network (PSTN) side. It only supports ECT as a user(Customer). So the behavior we are seeing is correct.

The only option you have is to use QSIG instead of T1/E1. QSIG Path Replacement – that is a peer-peer protocol and Communication Manager will send and respond to a QSIG Path Replace Propose operation.

Thanks,
Keyur