[Asterisk-Users] revisit to legacy PBX and CID over PRI

[mavince at optonline.net]

Looking at the bug below, I see an NSF of SDDN
> [20 02 00 e6]
> Network-Specific Facilities (len= 2) [ ACCUNET Switched Digital Service ]

The SDDN NSF is used for digital data, not voice.  Try not sending any NSF because an NSF can imply a Call-By-Call trunk group and I have seen that mismatch cause wacky D-channel behavior in the PSTN. If you really need to use an NSF, try SDN.

Generally when I see the D-channel restarting, I also check to make sure that there isn't another type of mismatch: Facility Associated Signaling (FAS) on one end and Non-Facility Associated Signaling (NFAS) on the other.

Mark Vince

Date: Thu, 8 Jun 2006 19:26:14 -0400
From: "C F" <shmaltz at gmail.com>
Subject: Re: [Asterisk-Users] revisit to legacy PBX and CID over PRI
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users at lists.digium.com>
Message-ID:
<81000b5a0606081626x287d8e4of8e79650b8fdb35b at mail.gmail.com>
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In paticular with Avaya systems I have seen this problem, it's on the
bug tracker here:
http://bugs.digium.com/view.php?id=4013