Voice is not getting transferred in conference

I am able to start conference, inviting another user to conferences and even my hangup handlers are also working fine. The only issue I am getting is that voice is not audible to UAC’s.

  1. When I use one UAC as Linphone and other as MicroSIP UAC , The voice is getting transferred from MicroSIP UAC to Linphone UAC but not vice-versa.

  2. When I use one both UAC as Linphone , No voice is getting transferred in any way.

Seems like it is codec issue, May be !!

in sip.conf, below are codec which I defined

[general]
allowoverlap=no
udpbindaddr=0.0.0.0
tcpenable=no
tcpbindaddr=0.0.0.0
transport=udp
srvlookup=yes
accept_outofcall_message=yes
outofcall_message_context=SEND_MSG
auth_message_requests=yes
qualify=yes
qualifyfreq=60
disallow=all
allow=ulaw,alaw,slin12,slin16,slin24,slin32,slin44,slin48,slin96,slin192
allowguest=no
canreinvite = no

Note: There are only two UAC’s are connected to conference

Please provide sip set debug on output for both callers and also core show channel output for both channels.