The issue with FreeSWITCH is just that 3pcc callflows (including invite w/o 
sdp) are disabled by default, they are certainly supported with a simple config 
change.

Mike

On Nov 11, 2009, at 9:09 AM, Scott Lawrence wrote:

> On Wed, 2009-11-11 at 08:24 -0500, M. Ranganathan wrote:
>> Hello,
>> 
>> In order to support late conference joins from sipxOpenfire, I am
>> working on implementing Flow 4 of RFC 3725 in sipxCallController.
>> 
>> This requires that the callee endpoint be able to respond sensibly to
>> an out of dialog INVITE (no sdp) in arc 4 Figure 4 of RFC 3725. Are
>> endpoints generally capable of such things or should I plan on
>> throwing in and additional INVITE (DUMMY SDP) and sned the INVITE (NO
>> SDP) in the established dialog ? I seem to recall some issues with
>> FreeSwitch in this context so I thought it would be wise to inquire.
> 
> Being able to respond to an INVITE that has no SDP is pretty basic.  If
> a phone can't support that, I suspect that it will have other problems
> that make it difficult to use with sipXecs.
> 
> That having been said, only testing will tell...
> 
> 
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