[Asterisk-Users] PRI Dropped Calls - Audit, Restore, Idle state

[Peter Svensson]

On Mon, 31 Jan 2005, Jeb Campbell wrote:

> We are using Asterisk on a T1 (pri) to Bellsouth.
> 
> Calls are getting dropped calls every 60 minutes and we asked Bellsouth 
> to debug the line.
> 
> (Note, this was told to me and I have no idea what it means)
> They said that we are sending an Audit and then Restore (to Idle state) 
> which causes the calls to be dropped.
> 
> Has anyone else experiencing this?  Any tips to verify or fix?

Does the drop correspond with a lot of lines like:
    B-channel 0/1 successfully restarted on span 1
in the log? 

Asterisk tries to restart all idle line once an hour. This should only 
affect the channels that are idle but on our equipment (a Panasonic PBX) 
all channels are dropped. We use the following patch to basically disable 
the resets:

--- asterisk/channels/chan_zap.c.ORIG   2004-06-15 17:56:09.000000000 +0200
+++ asterisk/channels/chan_zap.c        2004-06-15 17:56:24.000000000 +0200
@@ -135,7 +135,8 @@
 #define NUM_SPANS      32
 #define NUM_DCHANS     4               /* No more than 4 d-channels */
 #define MAX_CHANNELS   672     /* No more than a DS3 per trunk group */
-#define RESET_INTERVAL 3600    /* How often (in seconds) to reset unused channels */
+//#define RESET_INTERVAL       3600    /* How often (in seconds) to reset unused channels */
+#define RESET_INTERVAL (3600*24*1000)   /* How often (in seconds) to reset unused channels */
 
 #define CHAN_PSEUDO    -2

It is not a pretty patch, but it solved our problems. It really should be 
configurable.

Peter