Administrator’s Guide for SIP-T2xP IP Phones
190
486 Busy Here—Proxy Server
to User A
The proxy server forwards the 486 Busy
Here response to notify User A that User
B is busy.
ACK—User A to Proxy Server
User A sends a SIP ACK to the proxy
server. The SIP ACK message indicates
that User A has received the 486 Busy
Here message.
ACK—Proxy Server to User B
The proxy server forwards the SIP ACK
to User B to indicate that the 486 Busy
Here message has already been
received.
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