04-13-2012 10:11 AM - edited 03-16-2019 10:38 AM
I have a Cisco 3825 with a high-density voice module
Some of the phones that hang off this card can make calls, but will not ring when called: I can actually feel the hammer in the analog phone trying to ring, but it never hits the bell. Looks like it might be a voltage issue
The ports are configured thus:
voice-port 1/0/17
timeouts initial 60
timeouts interdigit 60
timeouts ringing infinity
dial-peer voice 5220 pots
destination-pattern 5220
port 1/0/17
Looking at the output when the phone is called:
1/0/18 -- fxs-ls up up on-hook ringing y
The analog phone is 400-500 feet away from the router
Does this look like a voltage problem?
Is there something I can do in the router to up the voltage?
04-13-2012 10:20 AM
Colin,
I dont remember the allowed cable length connecting the analog phone from FXS port of router but to quickly eliminate cable length issue, would you be able to take an analog phone & connect it locally on the router's FXS port to see it makes a difference ?
GP.
04-13-2012 10:27 AM
Beside loop length, have you measured resistance? And ground isolation ? Have you tried electronic ringer phones or only mechanical ?
There is nothing that can be done on router to increase ring current, beside hardware remedies.
04-13-2012 10:50 AM
I haven't tried an electronic ringer, nor have I measured resistance (I wouldn't even know how to go about doing that--I would imagine it requires an advanced cable tester)
04-13-2012 11:09 AM
No it only requires a $5 multimeter.
Try a different phone.
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