[Freeswitch-users] FreeSWITCH offering SRTP on Re-INVITE

[Michael Jerris]

After review of the sip trace,  I’d report that one to the zoiper guys.  There is no reason they should reject the call in that case.

> On May 17, 2018, at 4:48 PM, Andrew Cassidy <andrew at cassidywebservices.co.uk> wrote:
> 
> Good afternoon All,
> 
> I have experienced the following issue with Zoiper specifically (I have a support ticket open with them currently) and was wondering if it's something that could/should be fixed FreeSWITCH side.
> 
> If rtp_secure_media is set to optional, and SRTP is disabled on Zoiper, when FreeSWITCH sends the Re-INVITE, it sends crypto lines. Zoiper then replies with a 514 Unsupported Media Type and the timer refresh fails, causing Zoiper to hang up the call.
> 
> My current feeling is that as Zoiper ignored the crypto on the initial INVITE it should be them that then handles the Re-INVITE consistently by also ignoring the crypto lines but I'm not familiar enough with the RFCs to make a judgement.
> 
> The workaround is to either enable SRTP in Zoiper or don't set rtp_secure_media to optional when Zoiper is in use.
> 
> Kind regards,
>