Disconnect problem with FXS modules

[moropeza]

Hi, we have a 1751 Cisco IOS 12.2(8)YN connected to a KX-TD1232 PANASONIC PBX through a WIC-4FXS-DID.

After the call has been done is dropped and it happens in the first 25-40 secs.

In PBX we have a DISA Card to make the PSTN calls. The steps to make the phone calls are the following: 1.Voip FR using a FXS Port

2.PBX (DISA Card)

3.Dial a PSTN address

[irisrios]

Have you configured " isdn global-disconnect" command to allow passage of "release" and "release complete" messages over the voice network, in interface configuration mode. To disable the passage of these messages, use the no form of this command. Also try changing the cptone to some other values and check if it works.