1750 FXO Problem

[crisol]

1750 router at the remote site with FXO connected to a PABX system. When we command csim start

from the remote router to dial an analog line to the HQ. The phone rings. But when we

dial from an analog line at the remote site to HQ we hear a fast busy tone.

Using a 2650 remote router with FXO with same set up and config with 1750. The call from an

analog phone from remote site would push thru.

Is it a hardware issue or an IOS issue? why is it working with 2650 and not on 1750?

[a-vazquez]

Do you have any additional analog attached to the 1750 directly. Then may be you check if the calls through from the PBX connected phones to this analog phone,. This is just find if this VoIP routing issue or is it a FXO issue.

I strongly suspect FXO supervision signalling issues here. There may be some behaviour change between 1750 and 2650. May be you should explore on those lines