[cisco-voip] alarm panel issues and VG224 w/ SCCP

Thu Mar 24 18:48:13 EDT 2011

Thanks Nick. After talking with the client, it seems it's only one of a number of alarm panels that is causing the problem. So I'm not sure what the difference is between this unit and others. I'm hoping the client can set up a meeting with the vendor as soon as possible. 

Reading one of the threads, it talks about 4+2 or 4x2 as using touch tones and the contact ID using hook flashes. I wonder if switching modes will help. 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 

----- Original Message -----
From: "Nick Matthews" <matthnick at gmail.com> 
To: "Lelio Fulgenzi" <lelio at uoguelph.ca> 
Cc: "Jason Fuermann" <jason.f at shsu.edu>, cisco-voip at puck.nether.net 
Sent: Thursday, March 24, 2011 6:08:41 PM 
Subject: Re: [cisco-voip] alarm panel issues and VG224 w/ SCCP 

Can almost tell you the problem from the title of the email: 

The problem with using MGCP/SCCP on these ports is that they are going to do DTMF relay. They will take the TDM tone, convert it to sccp, and replay it on the other side. This doesn't jive with alarm panels because their timing is very specific. They basically use DTMF tones like modem tones and send information back and forth via DTMF. Because SCCP DTMF messages have a fixed duration when they are replayed, this interferes with the timing between digits and the actual digits themselves. 

The solution is to switch this to H323 (or SIP) and on your outbound dial peer omit any type of dtmf-relay. This allows the g711 stream to carry the dtmf natively to the headend. 

-nick 

On Thu, Mar 24, 2011 at 2:40 PM, Lelio Fulgenzi < lelio at uoguelph.ca > wrote: 

That was my suspicion. Just wondering if those who went from SCCP to MGCP/H323 were encountering the same thing. 

We'll have to see what the alarm vendor says. 

I'm hoping someone on the list who has sccp/h323 configured ports on a vg224 can help with my other questions. 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 

From: "Jason Fuermann" < jason.f at shsu.edu > 
To: "Lelio Fulgenzi" < lelio at uoguelph.ca >, cisco-voip at puck.nether.net 
Sent: Thursday, March 24, 2011 12:46:34 PM 
Subject: RE: [cisco-voip] alarm panel issues and VG224 w/ SCCP 

The head end is probably hanging up while the dialer is still spitting out codes, and the gw thinks it’s trying to dial an extension. Just a guess. 

http://markmail.org/message/kwzlalbdo2asbxqo 

From: cisco-voip-bounces at puck.nether.net [mailto: cisco-voip-bounces at puck.nether.net ] On Behalf Of Lelio Fulgenzi 
Sent: Thursday, March 24, 2011 10:55 AM 
To: cisco-voip at puck.nether.net 
Subject: [cisco-voip] alarm panel issues and VG224 w/ SCCP 

We have a remote site which uses alarms on their VG224. It seems they're not working properly. I've got a call back into the client to arrange a conference call with their alarm provider so I have access to technical details I can share. 

When I look at the CDRs, I see some strange entries. Basically a call to a toll free number, followed by short calls of 1 second with invalid DNs. (see below) 

I recall some talk about alarms and SCCP and it's better with MGCP. Can anyone who had this problem confirm if this was the same issue? 

I have no problem setting up a few ports for MGCP but I have some concerns: 

    • can I have a VG224 with some ports as SCCP and some as MGCP? 
    • how can I ensure that my MGCP ports work during failover, i.e. SRST? 

        • I don't want to have to redo all my dial-peers. I don't mind putting in one dial that sends all calls from the VG224 to the SRST router, but I'd like an inbound dialpeer from the VG224 that assigns the same class of service for all inbound calls from that vg224. 
        • Is this doable? 

call 1 	

call 2 

DateTimeOrigination 	

DateTimeOrigination 

Mar 8, 2011 10:02:10 AM 	

Mar 8, 2011 10:02:34 AM 

OriginalCalledPartyNumber 	

OriginalCalledPartyNumber 

1866------- <snip> 	

7000C 

FinalCalledPartyNumber 	

FinalCalledPartyNumber 

1866------- <snip> 	

7000C 

DateTimeConnect 	

DateTimeConnect 

Mar 8, 2011 10:02:22 AM 	

N/A 

DateTimeDisconnect 	

DateTimeDisconnect 

Mar 8, 2011 10:02:34 AM 	

Mar 8, 2011 10:02:36 AM 

Duration 	

Duration 

12 	

0 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 

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