[Spce-user] SEMS adds `a=direction:both` to SDP replies

[Jon Bonilla (Manwe)]

El Fri, 16 Jan 2026 14:16:44 +0000
Ben Kaufman via Spce-user <spce-user at lists.sipwise.com> escribió:

> In sems 1.7 (1.7-dev-488-gb0cd42b7-dirty) It seems that SEMS is adding an SDP
> line of a=direction:both to SDP replies, looks to be causing us problems with
> audio not connecting.  I have some very old versions of SEMS
> (1.5.0-49-gd756ee2) that are not doing this, even though they have the same
> config.
> 
> Is there a setting, etc. that can be used to direct sems to not alter SDP at
> all, including and especially adding a=direction... values?
> 

Hi Ben

Yes, that causes a lot of issues with some Sonus gateways. Your easiest way
(not best but easiest) is to remove those in kamailio-lb


#manwe patch for sonus based sbcs
#!ifdef CUSTOM_SONUS_FIX
if (has_body("application/sdp")) {
    replace_body_all("a=direction:both\r?\n", "");
}
#!endif
#manwe end



cheers,

Jon




-- 
PekePBX, the multitenant PBX solution
https://pekepbx.com
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