[asterisk-users] Problem with "AT&T Maintenance" protocol in PRI connection, no B+D channels available

[Doug Lytle]

Kanelbullar wrote:
> Hi guys,
>  
> We are experiencing a problem with a T1 PRI connection. After trying a 
> number of variations in the configuration files, the behavior is 
> always the same: no B channels come up and the D channel doesn't 
> appear to be working well. We can see there are AT&T Maintenance 
> messages being exchanged by asterisk and the provider, CONNECT and 
> CONNECT ACKNOWLEDGE, but that doesn't appear to be enough to bring the 
> D and B channels properly up. Are there any messages missing? When we 
> attempt to make a call, we can see the Q.931 SETUP message being sent. 
> But shortly after we are getting a LAPD DISC message, which ends up 
> originating a Q.931 DISCONNECT message, terminating the call.
>  
> What could be the problem here?
>
>     * Could there be any configuration issue on our side?
>     * Does libpri provide complete support to the AT&T Maintenance
>       protocol or could this connection be incompatible?
>
>  
>
> span=1,0,0,esf,b8zs,crc4

This needs to be span=1,1,0,esf,b8zs

I'm not sure if the crc4 is necessary. 

Doug


-- 
 
Ben Franklin quote:

"Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety."