exten => _001X.,n,Set(PJSIP_MEDIA_OFFER(audio)=!all,g729)
exten => _001X.,n,Set(PJSIP_SEND_SESSION_REFRESH()=invite)
exten => _001X.,n,Dial(PJSIP/Aside/sip:${EXTEN}@ip:5060,b(out-pre-dial,s,1))
[out-pre-dial]
exten => s,1,NOOP(Pre dialer)
exten => s,n,Set(PJSIP_SEND_SESSION_REFRESH()=invite)
exten => s,n,Return()