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New Member

1750 FXS fast busy

I have a 2fxs in my 1750. When I place the call from a phone on the network through a NBX to a phone plugged directly into the fxs port it works fine, phone will ring I can pick up and communicate. But when I place the call from the phone plugged directly into the fxs port to a phone on the network through the NBX system it will ring fine on both ends, but as soon as the phone is picked up I get a fast busy signal. This same result occurs when I try to place a call to a netmeeting client from the fxsport (not going through the NBX), It will ring fine but soon as call is answered there is a fast busy. All IP's are on the same subnet and not passing through the firewall. Please help!

2 REPLIES
Cisco Employee

Re: 1750 FXS fast busy

Have you checked the codecs?

New Member

Re: 1750 FXS fast busy

The codec in the 1750 is set at G711ulaw and the codec in my NBX was set to G7231 but changed it to G711 preferred (?) are these not compatable and may there be somewhere else that I need to change the Codec.

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