No subject

> I'm trying to add better support to libpri for maintenance
> protocol SERVice and SERVice ACKnowledgement messages.  The
> code is marked in q931.c as being a 'KLUDGE' and should be
> ripe by now for fixing.
>-
> Things work great on my test machine with a T400 and a loop
> back cable.  B-Channels are able to go in and out of
> service, and the state is stored in chan_zap.c so that
> channels out of service are immediately skipped when
> attempting a call on them (similar to Do Not Disturb.)
>-
> Problem is, I can't get it to work in the real world.  And
> given that this is a non-ITU message type, I'm not sure if
> it's me or the switch that doesn't want to play nice.  As
> best I can tell, these SERVice messages are defined in ANSI
> T1.607 with a list price of $360 -- no 3 freebie downloads
> like the ITU specs.  Thus, I've scoured various other web
> resources to cobble together the implementation.
>-
> If I'm correct in my assumptions so far, these NFAS/CCS
> SERVice messages are required for proper operation of backup
> D-Channels, in addition to maintenance of B-Channels.
> Currently, it appears although * supports the use of a
> backup D-Channel, it is not able to initiate a backup
> procedure -- only follow what the far-end switch does.
>-
> I'm attaching a patch of what I have so far, but what I
> could really, really use from some kind soul is a PRI trace
> of a proper SERV exchange for maintenance on a B-Channel.
> If you want to try the patch, it adds CLI commands:
> "zap service enable|disable|loop channel <chan num>"
> (Very similar to the Cisco IOS Dial Technologies command:
> "isdn service <chan num> state 0|1|2")

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Relationships       ID      Summary
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related to          0007963 NFAS primary D-channel always being mak...
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 (0103214) svnbot (reporter) - 2009-04-14 10:05
 http://bugs.digium.com/view.php?id=3450#c103214 
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Repository: libpri
Revision: 732

U   branches/1.4/libpri.h
U   branches/1.4/pri.c
U   branches/1.4/pri_internal.h
U   branches/1.4/pri_q921.h
U   branches/1.4/pri_q931.h
U   branches/1.4/q921.c
U   branches/1.4/q931.c

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r732 | jpeeler | 2009-04-14 10:05:22 -0500 (Tue, 14 Apr 2009) | 11 lines

Add service maintenance message support

This adds support for two new message types: Service and Service
Acknowledge.
When a channel receives a service message it will either take the channel
in
or out of service and then send a service acknowledgment. Although not
enforced here (enforced in chan_dahdi), the service messages are only
supported
with switch types 4ess/5ess. The required Asterisk changes will be coming
next.

(issue http://bugs.digium.com/view.php?id=3450)
Reported by: cmaj

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http://svn.digium.com/view/libpri?view=rev&revision=732 

Issue History 
Date Modified    Username       Field                    Change               
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2009-04-14 10:05 svnbot         Note Added: 0103214                          
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