A opção AllowsTransfer já esta ativa no ramal, porém eu não sou capaz de transferir a ligação.
Eu tenho o seguinte Log.
18-04-27 09:50:54] VERBOSE[48070][C-00000096] res_agi.c: "/var/www/html/mbilling/agi.php": [51164 Friend]:[ANSWEREDTIME=-DIALSTATUS=ANSWER]
[2018-04-27 09:50:54] DEBUG[10962] cdr.c: CDR for SIP/8600-00000122 is dialed and has no Party B; discarding
[2018-04-27 09:50:54] DEBUG[10961] devicestate.c: No provider found, checking channel drivers for SIP - 8600
[2018-04-27 09:50:54] DEBUG[10961] chan_sip.c: Checking device state for peer 8600
[2018-04-27 09:50:54] DEBUG[10961] devicestate.c: Changing state for SIP/8600 - state 1 (Not in use)
[2018-04-27 09:50:54] DEBUG[48070][C-00000096] pbx_variables.c: Result of 'SIPTRANSFER' is NULL