[cisco-voip] Door Opener Ring Delay

[Norton, Mike]

If it’s on an FXO port, this means the Valcom sends ringing.

I’m not 100% certain of the behavior of Cisco FXO ports, but with most interfaces of that sort, normally the only way to detect ringing is for the interface to listen to an entire ring cycle (or two ring cycles if it’s expecting Caller ID info), then it analyzes the signal and goes “yup, the line is ringing,” at which point it would route the call to the IP phone. If you think about it, this is sorta the same as with an analog phone: there’s no way to know that the line is ringing until after you’ve heard the ringing.

One ring cycle of a North American POTS line is 6 seconds (2 on + 4 off). Since the Valcom is not a telco POTS line, its ringing times could be longer/shorter. It could be using a non-standard ring timing that the FXO port struggles to detect if it’s expecting USA POTS ringing.

Commands I’d try playing with on the FXO port include cptone, ring number, no caller-id enable, and maybe timing min-ring. You might also try plar opx instead of just plar; a plar opx handles incoming ringing a bit differently. But I am most inclined to suspect that you don’t actually have any problem at all and that this delay is just a normal fact of life when listening for analog ringing.

If you don’t want to have to wait for ringing to be detected, then you need a device that can connect to an FXS port. An FXS port would be able to detect an off-hook condition immediately. However, FXS does not have real disconnect supervision, so it’d be a trade-off.

--
Mike Norton
I.T. Specialist
Peace Wapiti School Division No. 76



From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Steven Sarte
Sent: September-18-14 6:47 AM
To: Charles Goldsmith
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Door Opener Ring Delay

When trying with an analog phone, no delay.

What I did notice is that when running the debug vpm signal, the door button is pressed their is a delay about 10-12 seconds then the IP Phone rings and then I start seeing the debugs.

Of course Cisco and Valcom state their are no issues.

On Thu, Sep 18, 2014 at 12:21 AM, Charles Goldsmith <wokka at justfamily.org<mailto:wokka at justfamily.org>> wrote:
Is there a delay when you plug it into an analog and take the router out of the pic?  What I'm really asking, is the delay in the valcom or your router/CUCM?

On Wed, Sep 17, 2014 at 9:40 PM, Steven Sarte <steven.sarte at gmail.com<mailto:steven.sarte at gmail.com>> wrote:
Anyone have experience with a Valcom 2901A door opener.  Have it working with my 2911 and CUCM with an FXO port but their is a significant delay when you press the button and when the IP Phone rings.

Tried both H.323 and MGCP with no difference.

Current config:
voice-port 0/1/0
 connection plar 8999
 description Valcom V-2901A Door Opener
 station-id name Door

dial-peer voice 101 voip
 destination-pattern 8999
 session target ipv4:<CUCM IP>
 voice-class codec 1
 voice-class h323 1
 dtmf-relay h245-alphanumeric
 no vad

I did try connection plar 8999 immediate (no change)
als connection plar opx 8999 (no change)

Thanks in advanced
Steven

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