Blocked FXO Ports

Answered Question
May 2nd, 2008

Hi everybody

I have a CCM 4.2(3)sr3a and many sites with IP telephony. Each site has its Gateway, a Cisco 2811 with FXO cards installed to make and receive calls. The IOS versión of the routers is c2800nm-advipservicesk9-mz.124-3h.bin.

Some of the FXO ports in several sites don't work properly, they block and when a call is received/made in those ports, it gets a silence. when it happends, the "show voice port summary" command shows an status "up down".

I have to restart the port and in the most difficult cases I have to restart the router to get the normal status "up dorm" at the ports if they are idle. The case doesn't seem to be in a particular router, it happens in different ports, in different routers and at different times.

I wonder if it is a bug in the IOS.

Could you please help me with this issue?

this is the relevant configuration of the ports:

voice class custom-cptone DISCONNECT

dualtone disconnect

frequency 421

cadence 200 200

voice-port 0/0/0

supervisory disconnect dualtone mid-call

supervisory custom-cptone DISCONNECT

timeouts call-disconnect 0

timeouts wait-release 1

timing hookflash-out 50

connection plar opx 29035

description CABECERA_PBX

station-id name ENTRADA_1

station-id number 2434928

caller-id enable

and the normal in/out dial-peers

Thanks to everybody


Correct Answer by Paolo Bevilacqua about 8 years 9 months ago

Can you try 12.4(3j) ?

That to align with the latest bug fixes.

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Overall Rating: 5 (1 ratings)
nicocerti Wed, 05/28/2008 - 05:40

Hi Paolo

I update the IOS in many of the routers of the network. it seems to be very stable, I think it solved the problem, but I used a newer IOS version: 12.4(19).

thanks for your advice.


Paolo Bevilacqua Wed, 05/28/2008 - 05:51

Good, thanks for the appreciation and good luck!

Whn you want new features from the router w/ cme 4.2 I can suggest XW7 that is also stable now.


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