[asterisk-dev] decrease Max-Forwards header

[Klaus Darilion]

Raj Jain schrieb:
> On Tue, Sep 16, 2008 at 8:46 AM, Klaus Darilion
> <klaus.mailinglists at pernau.at> wrote:
>> Hi!
>>
>> Currently Asterisk sets the Max-Forwards header always to 70 for any
>> outgoing requests. IMO it would be cool to decrease the Max-Forwards on
>> outgoing SIP calls if the incoming channel is also a SIP channel. (E.g.
>> if you have multiple Asterisk servers mistakenly configured to route
>> calls in circle you could detect that loop).
>>
>> What do you think about that?
> 
> IMHO, this makes some sense but not a whole lot because in the
> scenario you mentioned Asterisk is acting as a B2BUA not a proxy. It

That is the problem. If you create a loop with proxies they will detect 
it (on SIP level).

But Asterisk will terminate the SIP call. If you configure a loop in 
Asterisk there is no chance to detect it as the hop counter is set to 
the default value every time.

IMO this would also make sense for SS7<->SIP Gatewaying to translate the 
SS7 hop counter to avoid SS7-SIP-SS7-SIP-SS7 loops.

regards
klaus

> is a proxy's job to detect loops and not B2BUA's. The other issue
> would be making the outbound leg aware of the signaling type of the
> incoming leg.
> 
> --
> Raj Jain
> 
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