Hi
Is it possible to force codec renegotiation when call is forwarded to a voicemail
example
I have sip phone in LAN that use G.711 , G.729 and declared to support both G.711 and G.729 in sip.conf
but I have Voice mail messages and announces stored in G.729 format
if one sip phone is forwarded to Voicemail ==> the other sip phone are unable to renegotiate G.729 codec
So how to force codec renegotiation when forwarding call to a voicemail or another extension or a peer