[Freeswitch-users] Hack for Zoiper speex codec payload problem

Mateusz Bartczak netcentrica at gmail.com
Fri Oct 17 13:53:14 MSD 2014

Hi All,

I have problem with getting Zoiper with enabled codec speex/8000 working
with FS. I saw some discussions about this problem before, but none of them
ended with working solution.

Maybe these days some of you can share some hints how to hack this

Problem is that Zoiper sends SDP payload type 110 for speex/8000, but FS
expects other type for that codec.

I tried to rewrite SDP on OpenSIPS proxy that sits between end users and FS
box, and then later rewrite replies with SDP payload generated by FS to 110
code, but calls always end-up with codec negotiation failure

And yes, I know that zoiper is broken, please don't paste RFC here :)

It gets very popular on mobile devices and I'm forced to provide support
for it, even if its broken
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