Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
954
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
in the Call-ID field.
The transaction number within a
single call leg is identified in the
Содержание SIP-T2 Series
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Страница 45: ...Getting Started 23 For SIP T42G T41P T40P Desk Mount Method Wall Mount Method Optional...
Страница 47: ...Getting Started 25 For SIP T23P T23G Desk Mount Method Wall Mount Method Optional...
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Страница 757: ...Configuring Advanced Features 735 The IP phone reboots automatically to make settings effective after a period of time...
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Страница 812: ...Administrator s Guide for SIP T2 Series T19 P E2 T4 Series CP860 IP Phones 790 6 Click Confirm to accept the change...
Страница 1005: ...Appendix 983...