BudgeTone-100 User Manual
Grandstream Networks, Inc.
The SIP message flow based on BYE/Also: method looks something like this:
Transferee
Transferor
Recipient
INVITE
100/180/200
ACK
RTP Media
REFER
501
Not
Implemented
BYE with “Also:”
200
INVITE
100/180/200
ACK
RTP Media
16