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

[Nick Matthews]

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)
>
>
> _______________________________________________
> cisco-voip mailing list
> cisco-voip at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
>
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