Bug#687970: dahdi-source: doorphone device ignored by asterisk after upgrade

[Clint Adams]

Package: dahdi-source
Version: 1:2.6.1+dfsg-1
Severity: normal

After upgrading from squeeze to wheezy, the doorphone device plugged into the second
port of a TDM404B card is ignored by Asterisk.  I'm not sure which component is the
problem here, so I'm starting with dahdi-source.

With debugging turned on it seems that the kernel is detecting the rings.
Sep 17 13:19:38 brandeis kernel: [  244.396805] wctdm24xxp 0000:06:02.0: BATTERY on 1/2 (-)!
Sep 17 13:19:38 brandeis kernel: [  244.808788] wctdm24xxp 0000:06:02.0: RING on WCTDM/0/1!
Sep 17 13:19:39 brandeis kernel: [  245.860747] wctdm24xxp 0000:06:02.0: NO RING on WCTDM/0/1!
Sep 17 13:19:40 brandeis kernel: [  246.915711] wctdm24xxp 0000:06:02.0: RING on WCTDM/0/1!
Sep 17 13:19:41 brandeis kernel: [  248.226657] wctdm24xxp 0000:06:02.0: NO RING on WCTDM/0/1!
Sep 17 13:19:42 brandeis kernel: [  249.272623] wctdm24xxp 0000:06:02.0: RING on WCTDM/0/1!
Sep 17 13:19:44 brandeis kernel: [  250.584572] wctdm24xxp 0000:06:02.0: NO RING on WCTDM/0/1!
Sep 17 13:20:10 brandeis kernel: [  276.865675] wctdm24xxp 0000:06:02.0: NO BATTERY on 1/2!

The port has a RED alarm, though this may have also been the case in squeeze.
Span 1: WCTDM/0 "Wildcard TDM410P" (MASTER) 

           1 WCTDM/0/0 FXSKS (In use) (EC: MG2 - INACTIVE) 
           2 WCTDM/0/1 FXSKS (In use) RED (EC: MG2 - INACTIVE) 
           3 WCTDM/0/2 FXSKS RED 
           4 WCTDM/0/3 FXSKS RED 


The line connected to the first port works fine, but at no point does Asterisk show
any indication that line 2 is ringing, nor does it answer or appear to do anything
else in response.  I also tried switching to fxs_ls signalling but there was no
difference.

How can I track down the problem?