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<TITLE>RE: Strange behaviour in SOFIA SIP</TITLE>
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<P><FONT SIZE=2>Preconditions on sip profile<BR>
----------------------------<BR>
inbound-codec-prefs NOT set<BR>
outbound-codec-prefs NOT set<BR>
inbound-proxy-media=TRUE<BR>
inbound-bypass-media=FALSE<BR>
inbound-late-negotiation=TRUE + inherit_codec=TRUE<BR>
<BR>
TEST scenario<BR>
-------------<BR>
SIP phone send INVITE with SDP to FS<BR>
<BR>
INVITE<BR>
SDP[codelist=PCMA, PCMU, G722, G729] --> FS<BR>
<BR>
FS has just the CORE_PC_MODULE [PCMA, PCMU, PASS-THR, VIDEO-PASS-THR, L16]<BR>
<BR>
The "ep_codec_string" channel variable is loaded with [PCMA, PCMU]<BR>
<BR>
EXPECTED<BR>
--------<BR>
In "proxy-media + late-negotiation" scenario: ep_codec_string=[PCMA,PCMU,G722,G729]<BR>
<BR>
PROBLEM<BR>
-------<BR>
According to the documentation (http://wiki.freeswitch.org/wiki/Codec_negotiation):<BR>
<BR>
"ep_codec_string: This variable is only available if late negotiation is enabled on the profile. It's a readable string containing all the codecs proposed by the calling endpoint."<BR>
and<BR>
"inherit_codec=true (only applicable when late-negotiation is enabled) will take the codec negotiated when the B leg answers and pass it to the A leg so it also uses the same codec (if the A leg supports it); otherwise, it will use whatever it can from its own list"<BR>
<BR>
The variable ep_codec_string doesn't contain ALL the codecs proposed by the calling endpoint. It contains the intersection between the codecs proposed by the calling and the codecs loaded in FS.<BR>
In proxy-media / no-media configuration the called endpoint doesn't have the calling codec list so he can't negotiate using all the capabilities available.<BR>
(I'm working on a test endpoint module that should work in proxy and no-media configuration ... mod_sofia vs mod_sofia works because they look at the remote sdp variable)<BR>
<BR>
Source reference - sofia_glue.c->sofia_glue_set_r_sdp_codec_string()<BR>
<BR>
<BR>
Regards,<BR>
Giovanni<BR>
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