You could remove the mgcp service from the fxs port, then create your dial 
peers (assuming your alarm only wants tone and doesn't need inward).



From: le...@uoguelph.ca
Date: Mon, 2 Mar 2015 08:21:51 -0500
To: jandrewar...@ccgs.wa.edu.au
CC: cisco-voip@puck.nether.net
Subject: Re: [cisco-voip] FXS voltages / POTS compatibility

Does this mean you have an h323 gateway? Right now, I have MGCP, which I'm 
guessing, precludes me from doing this. 

Sent from my iPhone
On Mar 2, 2015, at 7:51 AM, James Andrewartha <jandrewar...@ccgs.wa.edu.au> 

With our security systems I have to remove the call manager from the call path 
for the system to complete due to the nonstandard tones they send. From my 
notes on how to configure this:
On the VG224s:
voice class h323 1  h225 timeout tcp establish 3voice-port 2/13  no 
timeoutsdial-peer voice 23 pots  service stcappdial-peer voice 99 voip  
description h323 direct to voip1 for alarm number  destination-pattern 13451015 
 session target ipv4:  voice-class h323 1  codec g711ulaw  no 
vaddial-peer voice 98 voip  description h323 direct to voip2 for alarm number  
preference 1  destination-pattern 13451015  session target ipv4:  
voice-class h323 1  codec g711ulaw  no vad
On the 2921s:
voice service voipip address trusted list  ipv4
The AVG is, the 2921s are and .6, and dial-peer voice 23 
is for voice-port 2/13. These are GE security panels I think (which their MAC 
OUI confirms).
-- James AndrewarthaNetwork & Projects EngineerChrist Church Grammar 
SchoolClaremont, Western AustraliaPh. (08) 9442 1757Mob. 0424 160 877
From:  Justin Steinberg <jsteinb...@gmail.com>
Date:  Monday, 2 March 2015 2:14 am
To:  chris <tknch...@gmail.com>
Cc:  Cisco VOIP <cisco-voip@puck.nether.net>
Subject:  Re: [cisco-voip] FXS voltages / POTS compatibility

Are you using local h323 or sip 'pots' dialpeers to route directly between your 
FXS and T1 port?  Or is call manager in between the call due to MGCP or VOIP 
dialpeers involved in the dialplan ?I doubt your issue is line voltage, since 
you can see the call being placed.  My guess is the DSP is processing the call 
and causing issues.  I've seem alarm boxes use nonstandard DTMF transmission 
that isn't properly recognized by the DSP.The 2800 supports DSP bypass by 
default when you route directly between ports using POTS dialpeers.   You do 
need to have properly configured network clock configuration.Can you send a 
copy of your config along with the output of 'show controller t1' and 'show 
network-clock'JustinOn Feb 28, 2015 10:33 PM, "chris" <tknch...@gmail.com> 
Hey Ryan,
We have a channelized T1 with channels split between voice/data so the voice 
path is TDM. We have a VIC-4FXS/DID and for each of the two ports we have a 
single copper pair with rj11 on both ends, one side going to the FXS port and 
the other is going into alarm panel. The total distance from the 2800 to the 
alarm panel is around 20-30 feet and its a direct run, no 66 blocks or anything 
in between.Don't know model of the panel (this is another location) 
>From what I've read I think the problem is the default idle-voltage the 
>VIC-4FXS/DID is only -24V but based on the link I sent in the first email I 
>thought this could be reconfigured through the idle-voltage option but this 
>doesnt seem to be available when I try to enter it under the voice-port. When 
>I talked to the alarm company and told them I see the calls going through the 
>guy told me the alarm doesn't check the line state based on the dialtone and 
>he said that it uses the voltage to see when the line is idle, ringing, etc 
>and I think this is where the problem lies.
Someone recommend this adapter offlist which looks interesting but the price is 
a little nuts as it costs more than all the equipment we have installed at this 
site combined. 


On Sat, Feb 28, 2015 at 8:18 PM, Ryan Huff <ryanh...@outlook.com> wrote:
Chris,Can you diagram the connections for me? Are the copper pairs swinging off 
a 66 block before terminating to the alarm panel or is there a direct copper 
path between the fxs port and the alarm? Are you using an RJ-11 or RJ-14 
configuration?Could you estimate the copper distance between the termination 
points?Is the pstn path for the VG SIP or TOM?Also, I would be curious to know 
if the alarm panel is a Simplex Grinnell?Thanks,Ryan

-------- Original Message --------
From: chris <tknch...@gmail.com>
Sent: Saturday, February 28, 2015 07:52 PM
To: cisco-voip@puck.nether.net
Subject: [cisco-voip] FXS voltages / POTS compatibility

HelloWe have a location with a 2800 acting as a voice gateway where we have 2 
FXS voice ports going to an alarm system. We are using the vic-4fxs/did line 
card.We have the alarm company saying they are seeing the panel reporting Comm 
trouble so we checked the call records and we also did some debugging in 
realtime and we see the calls are going out and when we plug a test set in the 
dial tone is good.In talking with the alarm company and researching we have 
come to believe the issue may be due to the idle and ringing voltages. We came 
across this 
 looked promising however when we are in voice port configuration node we do 
not have the idle-voltage setting available. We tried several iOS versions in 
12.4 as well as 15.x hut no luckIs this line card not capable of -48 idle 
voltage? What cards are? Do we need anything special as far iOS version?Ideally 
we want to have 2 voice ports that are as close to a standard pots line as 
possible.We are a bit lost as its the first time we have hit an issue like this 
and we are just hoping someone has been down this path before. If we have to 
change line cards or even to another platform we are open to it as long if 
someone has a setup that is known working in this manner Thanks in advance 

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