[Freeswitch-users] 100rel support

Steven Ayre steveayre at gmail.com
Tue Apr 17 09:41:59 UTC 2018

I've been wondering this for a few years too. I'm guessing that comment has
scared everyone away from enabling it to test it out.

At a guess if there's any issue it's within the Sofia-SIP stack and
therefore trickier to debug/patch than in mod_sofia.

You could enable it and if there are any problems report them on Jira so
they get looked into.

I believe 100rel might be required for IMS implementations.

On 17 April 2018 at 06:08, David Witham <david.witham at netsip.com.au> wrote:

> Hi all,
> We have had an upstream provider request that we enable 100rel support. I
> note in the wiki it says:
> enable-100rel
> This enable support for 100rel (100% reliability - PRACK message as
> defined in RFC3262 <http://tools.ietf.org/html/rfc3262>) This fixes a
> problem with SIP where provisional messages like "180 Ringing" are not
> ACK'd and therefore could be dropped over a poor connection without
> retransmission. *2009-07-08:* Enabling this may cause FreeSWITCH to crash,
> see FSCORE-392 <http://jira.freeswitch.org/browse/FSCORE-392>.
> <param name="enable-100rel" value="true"/>
> FSCORE-392 doesn't say if the crashing related to enabling 100rel was ever
> fixed. Can anyone confirm whether it is now safe to enable 100rel support?
> regards,
> David
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