FXS port problem

Unanswered Question
Oct 24th, 2007
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Hi,


i have a GSM adapter plugged into a fxs port.

If i place a call from a IP phone everything works fine. If i put on hook the ip phone and try to place another call i get a busy tone and the only way is to unplugs and plugs again the cable that connect the fxs port with the gsm adapter.

I suppose it's a signaling problem

here is the voice port config

voice-port 2/1/0

no vad

compand-type a-law

no comfort-noise

cptone IT

timeouts call-disconnect 3

timeouts wait-release 3

bearer-cap Speech

any idea?

thx

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paolo bevilacqua Wed, 02/13/2008 - 03:50
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Hi, the problem is due to the gsm adapter. If it doesn't go on-hook for any reason, it's normal that you call and find it busy.


For this reason it is recommended to use GSM adapter with either BRI or IP/SIP interface.

guilhem.perez Wed, 02/13/2008 - 04:07
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Hi


thanks answering so quickly.


So I can't use a GSM adapter with FXS

paolo bevilacqua Wed, 02/13/2008 - 04:11
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Is not that you can't, but you must make sure that it goes on-hook and doesn't keep the line busy.


Perhaps it expects power denial from the router, or a disconnect tone, all thing the router can do, but you must check what your gsm adapter wants.


With ISDN BRI, there is no problem like that so it's much easier.


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