Appendix
539
2.
User B answers the call.
3.
User A places User B on hold.
User A
Proxy Server
User B
F1. INVITE B
F2. INVITE B
F7. ACK
F8. ACK
F3. 180 Ringing
F6. 200 OK
F5. 200 OK
F4. 180 Ringing
F12. 200 OK
F9. INVITE B (sendonly)
F10. INVITE B (sendonly)
F11. 200 OK
F14. ACK
F13. ACK
No RTP packets being sent
2-way RTP channel established
Step
Action
Description
F1
INVITE—User A to Proxy
Server
User A sends an INVITE message to a
proxy server. The INVITE request is an
invitation to User B to participate in a
call session.
In the INVITE request:
The IP address of User B is inserted
in the Request-URI field.
User A is identified as the call
session initiator in the From field.
A unique numeric identifier is
assigned to the call and is inserted
Summary of Contents for SIP-T2XP
Page 1: ......
Page 28: ...Administrator s Guide for SIP T2xP IP Phones 10 ...
Page 66: ...Administrator s Guide for SIP T2xP IP Phones 48 ...
Page 280: ...Administrator s Guide for SIP T2xP IP Phones 262 ...
Page 456: ...Administrator s Guide for SIP T2xP IP Phones 438 ...
Page 494: ...Administrator s Guide for SIP T2xP IP Phones 476 ...
Page 524: ...Administrator s Guide for SIP T2xP IP Phones 506 ...