[Asterisk-Dev] Re: [Asterisk-Users] Re: Loop Detection

[Daniel Corbe]

Doug,

Last night I attempted exactly what you just described.  I commented
the if { block in chan_sip.c which contains the loop detection code
and tried to place a call.  This caused the Asterisk server to dump
core.

I did a little more research into the subject and found this:

Apparently Asterisk's Call ID behavior is slightly modified if you go
into chan_sip.c and set the variable "pedanticsipchecking" to 1.

This causes Asterisk to not only compare the Call ID of the call but
the TAG= line in the header.

This behavior is more RFC compliant than the default behavior; however
after enabling this and placing a few test calls I seem to get
extremely long delays in establishing the forwarded leg of my calls
and the RTP stream is not being relayed correctly.

I'm currently at a loss.  I am seriously considering replacing this
Asterisk TDM gateway with a Cisco 5350.

-Daniel

On 4/15/05, Doug Meredith <doug.meredith at skyridge.com> wrote:
> Daniel Corbe <daniel.junkmail at gmail.com> wrote:
> 
> >Is there any way to turn Loop Detection off or tune the params a bit?
> >I am having an issue with Call Forwarding on my SIP Proxy Server which
> >is causing me great pains.
> 
> All I can do is sympathize.  The same problem occurs when a call comes
> in through Asterisk, gets sent to SER, then comes back to Asterisk 20
> seconds later for voicemail.
> 
> I have contemplated just commenting out the check in chan_sip.c, but I
> haven't tried this.  Not sure if this might cause other problems.
> 
> Asterisk has many SIP deficiencies.  Asterisk has been built as a
> monolithic PBX, and it seems to do okay using SIP phones as channels.
> If you want Asterisk to simply act as a SIP UA, you are going to run
> into a whole slew of problems.  I'm not holding my breath waiting for
> this to change.
> 
> Doug
> --
> Doug Meredith (doug.meredith at systemguard.com)
> SystemGuard - Oracle remote support
> 877-974-8273 (87-SYSGUARD)
> 506-854-7997
> www.systemguard.com
> 
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