Absolute_codec_string is how you would force only an individual codec out the b leg as you’ve noted. The other ways are about passing through the a leg codecs with some preferences and tweaks, mix adds our other codecs at the end. These codecs are offered to the b leg then it chooses which to use. If you ONLY want to offer PCMA out the b leg, absolute_codec_string is the right way.
On Jan 23, 2020, at 8:14 AM, Kliment Toshkov, Netfinity JSC <kliment.toshkov@netfinity.bg> wrote:
Hello,
I have to force transcoding between PCMU and PCMA in the following scenario:
Customer [PCMA, PCMU, G729] > Kamailio > Freeswitch 1..N > termination gateway [PCMA]
I need transcoding from PCMU and G729 to take place on Freeswitch boxes. Currently it works for G729 but for PCMU calls they are originated with PCMU.
Inbound profile: <param name="inbound-codec-prefs" value="$${global_codec_prefs}”/> <param name="disable-transcoding" value="false"/>
Outbound profile: <param name="outbound-codec-prefs" value="$${outbound_codec_prefs}"/> <param name="disable-transcoding" value="false"/>
vars.xml: <X-PRE-PROCESS cmd="set" data="global_codec_prefs=PCMA,PCMU,G729"/> <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=PCMA"/>
In xml dial plan: <action application="set" data="inherit_codec=false"/> <action application="set" data="media_mix_inbound_outbound_codecs=true"/>
But the calls are still not transcoded between PCMU and PCMA.
Only one thing worked - forcing the codec in bridge app: <action application="bridge" data="{absolute_codec_string='PCMA'} ..."/>
But I really need to know what I am missing and how to fix it using config files only. Brute force is not preferred.
Thank you!
Kliment Toshkov Key Accounts
24/7: 0700 30000 w: www.netfinity.bg <http://www.netfinity.bg/> t: +359 2 4918888 f: +359 2 4815555
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