SIP method invite re-invite
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8x8 IP Trunking
...This modification can involve changing addresses or ports, adding a media stream, deleting a media stream, and so on. This is accomplished by sending a new INVITE request within the same dialog that established the session. An INVITE request sent within an existing dialog is known as a re-INVITE.
Note that a single re-INVITE can modify the dialog and the parameters of the session at the same time.
re-INVITE caused a lot of trouble if we don't know exactly what's going on with UAC/UAS at the time re-INVITE happen.
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