[Asterisk-Dev] TE410P B-channel restart

[CW_ASN]

Peter Svensson wrote:

>On Sun, 20 Feb 2005, CW_ASN wrote:
>
>  
>
>>>The spec (Q.931, page 45) clearly states otherwise:
>>>
>>>3.4.1 RESTART
>>>This message is sent by the user or network to request the recipient
>>>to restart (i.e. return to an idle condition) the indicated
>>>channel(s).  See Table 3-49.
>>>
>>>The table immediately following this explicitly shows that RESTART
>>>IEs may go in either direction, with the only exception being the
>>>Display IE (which is network-to-user only).
>>>
>>>      
>>>
>>As implemented in class 5 switches using EuroISDN, the restart initiated 
>>by cpe side is not allowed.
>>    
>>
>
>Interesting. What part of the stanard states that? From what I can see in 
>EN 300 403-1 RESTART is allowed in both directions. Clause 5.5.1 in that 
>standard states 
>  "A RESTART message is sent by the network or user in order to return 
>   channels or interfaces to the idle condition."
>
>We do not use the idle restart ourselves. It should not be needed and may 
>do harm (is there a race where the remote end sends a SETUP at the same 
>time Asterisk sends a RESTART?). 
>
>Peter
>  
>
I can say about implementations in latin america, in AXE10 and EWSD. In 
those switches (and I think in the rest of switches) don't send restart 
when are set as cpe. Maybe a national variants? Anyway, let me find the 
software inplementation in those switches to send you a details.
The strict sense of restart is to assure the correct creation and idle 
state of channels in both sides. At least I always saw that it is used 
for this function.
I never saw a restart in busy channels (is a weird situation).

Gus