[cisco-voip] Connection PLAR problem...

[Ryan Huff]

I would replace the copper pair between the FXS port and the analog phone and then test again. If you are using a custom copper pair, try putting a few twists in the pair and then re-crimp/punch-down both ends. Is this FXS port under IOS control, stcapp or mgcpapp?

If it truly is an audible artifact, it may in-fact be caller ID; Bell 202 AFSK transmits at 1200 baud half-duplex (1200Hz/2200Hz) between rings 1 and 2 (this is how CLID works on analog POTS lines).Does the called party hear this only if they pick up within 2 rings?What happens if the called party waits for 4-5 rings before picking up?Try "caller-id disable" on the voice-port and then test.

You could also try an antitinkle circuit (frequency filter). You would do this by adjusting the "ring frequency" on the FXS port.

Another thing to try is adjusting the idle battery (line voltage) on the FXS port to a true -48V, if your FXS port supports it.

Paste the voice-port and dial-peer config for the FXS port in question (and if it is MGCP/SCCP controlled, then the MGCP and SCCP portion of the config).
Thanks,

Ryan
From: mikenorton at pwsd76.ab.ca
To: michelmbperez at gmail.com; cisco-voip at puck.nether.net
Date: Fri, 19 Jun 2015 05:17:49 +0000
Subject: Re: [cisco-voip] Connection PLAR problem...









Are you certain it’s DTMF that you’re hearing, not caller ID? If you pick up too soon (before 2 rings) it could be possible you’re hearing caller ID.
 
Other than that, with analog phones, weirdness with onhook/offhook/ringing state is often a cabling issue, e.g. partial short, poor connection, or too long. Or
 loopstart/groundstart is set incorrectly on the port.
 
-mn
 
From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net]
On Behalf Of Michel L. M. B. Perez

Sent: Thursday, June 18, 2015 7:46 AM

To: cisco-voip at puck.nether.net

Subject: [cisco-voip] Connection PLAR problem...
 

Hi guys,

 


I found a problem in my router 2911, i think that is a config mistake, let me try to explain.


 


In the beggining i thought that it was IOS problem so a made a upgrade from c2900-universalk9-mz.SPA.152-4.M6a.bin to version c2900-universalk9-mz.SPA.154-3.M3.bin


 


I have this same configuration at the some router on another interface an this is not happening.


 


Analog Phone -> FXS Post -> Branch_Router -> CUCM -> IP Phone  [Call is completed, Voice is Working, No Problem]


IP Phone -> CUCM -> Branch_Router -> FXS port -> Analog Phone [Call is completed, Voice is Working, Problem]


 


When the remote users answer the call, in the beggining of the call i can hear a sound like the phone was trying to dial a number, for me seems that the router is not understanding that is an incoming call and when the user hang-up the
 phone the router is trying to dial the number configured at connection plar at this voice port.


 


Anyone already have the same problem?


 


Thanks.







--


Michel Perez


Skype: michelmbperez


michelmbperez at gmail.com


http://br.linkedin.com/in/michelmbperez









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