We have call transfer issue when tranfered call to internal extension(DN) using Transfer command, but same call successed if I used Dial command.
Any one suggest how to resolve this issue when I use Transfer command
[2017-05-18 08:39:50] NOTICE chan_sip.c: Got unknown code '404' in NOTIFY in response to REFER.
[2017-05-18 08:39:50] NOTICE chan_sip.c: Transfer failed. Sorry. Nothing further to do with this call