During Jingle A/V RTP calls, Movim is not building extmap attribute correctly

[goffi-contrib]

While doing a RTP call, Movim being the initiator, if the other peer send XEP-0294 <rtp-hdrext> elements like those:

<rtp-hdrext xmlns="urn:xmpp:jingle:apps:rtp:rtp-hdrext:0" id="1" uri="urn:ietf:params:rtp-hdrext:ssrc-audio-level" senders="both"/>
<rtp-hdrext xmlns="urn:xmpp:jingle:apps:rtp:rtp-hdrext:0" id="3" uri="urn:ietf:params:rtp-hdrext:sdes:mid" senders="both"/>

Movim convert it to following SDP:

a=extmap:1 both urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:3 both urn:ietf:params:rtp-hdrext:sdes:mid

This is invalid and result in failed call:

• the senders value is used directly while it should be mapped to a direction value ("sendonly", "recvonly", "sendrecv", or "inactive"). This is most probably related to Movim is sending incorrect value in 'senders' attribute of XEP-0294 #1212
• the direction should not be put after a space, but after a /

Reference: https://datatracker.ietf.org/doc/html/rfc8285#section-8

Tested with Movim v0.21rc7

[edhelas]

Fixed in b5b7aa0