[asterisk-dev] pjsip / asterisk 16: Question regarding 100rel / PRACK

Michael Maier m1278468 at mailbox.org
Sat Oct 24 14:16:41 CDT 2020

Hello Joshua,

On 13.10.20 at 13:01 Joshua C. Colp wrote:
> On Tue, Oct 13, 2020 at 7:49 AM Michael Maier <m1278468 at mailbox.org> wrote:
> <snip>
>> My question (because always if a call was dropped, PRACK has been in use):
>> Is it a good idea to use a subsequent CSeq for the PRACK on Asterisk side,
>> which is reused later on by the provider for the update (in this example)?
>> Probably it shouldn't harm - but
>> could this for some devices be nevertheless a problem? For now, I disabled
>> 100rel support on Asterisk trunk side (it was on by default). Let's wait
>> and see what happens ... .
> Purely from a sequence number perspective there is a local sequence number
> and remote sequence number, they are independent and could conceivably
> match up at times but that by itself should not cause an issue within the
> specification itself. I can't speak towards any issues or assumptions
> within the SIP implementation of the remote side though.

You're right - it happened again meanwhile w/o PRACK being enabled.


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