Nortel-networks NN10265-111 Instrukcja Użytkownika Pobierz pdf (Strona 114)

NN10265-111 MCS 5100 3.5 Standard 4.0 January 2006

114

Basic call with firewalls

Figure 54, Basic call flow using the RTP Media Portal (with obscured

endpoints), on page 114 shows the basic call flow for a client-to-client

call using an RTP Media Portal with Address and Port Discovery (APD)

functions enabled to facilitate firewall/NAPT traversal requirements.

Figure 54 Basic call flow using the RTP Media Portal (with obscured endpoints)

SIP

Module

Application

Client A

Client B

2. Resource request for B

3. Response with A’

1. Invite (SDP of B)

11. BYE

RTP

Portal

Media

4. Invite (SDP of A’)

5. Answer (SDP of B)

6. Resource request for A

9. First media packet

13. Delete resource A’

15. Resource deleted

Firewall/NAT A

14. Delete resource B’

Firewall/NAT B

8. Answer

10. First media packet

12. BYE

7. Response with B’

Media Path established between A and B

Connect new resource to A’

16. Resource deleted

from A to B’

from B to A’

(SDP of B’)

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Nortel-networks NN10265-111 Instrukcja Użytkownika Strona 114