Chapter 23 Voice
VMG5313-B10A/-B30A Series User’s Guide
288
The following table shows the SIP call progression.
1
User Agent 1
sends a SIP INVITE request to
Proxy 1
. This message is an invitation to
User
Agent 2
to participate in a SIP telephone call.
Proxy 1
sends a response indicating that it is trying
to complete the request.
2
Proxy 1
sends a SIP INVITE request to
Proxy 2
.
Proxy 2
sends a response indicating that it is
trying to complete the request.
3
Proxy 2
sends a SIP INVITE request to
User Agent 2
.
4
User Agent 2
sends a response back to
Proxy 2
indicating that the phone is ringing. The response
is relayed back to
User Agent 1
via
Proxy 1
.
5
User Agent 2
sends an OK response to
Proxy 2
after the call is answered. This is also relayed
back to
User Agent 1
via
Proxy 1
.
6
User Agent 1
and
User Agent 2
exchange RTP packets containing voice data directly, without
involving the proxies.
7
When
User Agent 2
hangs up, he sends a BYE request.
8
User Agent 1
replies with an OK response confirming receipt of the BYE request, and the call is
terminated.
Voice Coding
A codec (coder/decoder) codes analog voice signals into digital signals and decodes the digital
signals back into analog voice signals. The VMG supports the following codecs.
• G.711 is a Pulse Code Modulation (PCM) waveform codec. PCM measures analog signal
amplitudes at regular time intervals and converts them into digital samples. G.711 provides very
good sound quality but requires 64 kbps of bandwidth.
Table 118
SIP Call Progression
UA 1
PROXY 1
PROXY 2
UA 2
Invite
Invite
100 Trying
Invite
100 Trying
180 Ringing
180 Ringing
180 Ringing
200 OK
200 OK
200 OK
ACK
RTP
RTP
BYE
200 OK
Содержание VMG5313-B10A
Страница 15: ...15 PART I User s Guide ...
Страница 16: ...16 ...
Страница 32: ...Chapter 2 The Web Configurator VMG5313 B10A B30A Series User s Guide 32 ...
Страница 40: ...Chapter 4 Tutorials VMG5313 B10A B30A Series User s Guide 40 ...
Страница 71: ...71 PART II Technical Reference ...
Страница 72: ...72 ...
Страница 78: ...Chapter 5 Network Map and Status Screens VMG5313 B10A B30A Series User s Guide 78 ...
Страница 106: ...Chapter 6 Broadband VMG5313 B10A B30A Series User s Guide 106 ...
Страница 162: ...Chapter 9 Routing VMG5313 B10A B30A Series User s Guide 162 ...
Страница 180: ...Chapter 10 Quality of Service QoS VMG5313 B10A B30A Series User s Guide 180 ...
Страница 198: ...Chapter 11 Network Address Translation NAT VMG5313 B10A B30A Series User s Guide 198 ...
Страница 210: ...Chapter 14 Interface Group VMG5313 B10A B30A Series User s Guide 210 ...
Страница 218: ...Chapter 15 USB Service VMG5313 B10A B30A Series User s Guide 218 ...
Страница 232: ...Chapter 17 Firewall VMG5313 B10A B30A Series User s Guide 232 ...
Страница 240: ...Chapter 19 Parental Control VMG5313 B10A B30A Series User s Guide 240 ...
Страница 250: ...Chapter 21 Certificates VMG5313 B10A B30A Series User s Guide 250 ...
Страница 296: ...Chapter 23 Voice VMG5313 B10A B30A Series User s Guide 296 ...
Страница 300: ...Chapter 24 Log VMG5313 B10A B30A Series User s Guide 300 ...
Страница 308: ...Chapter 27 xDSL Statistics VMG5313 B10A B30A Series User s Guide 308 ...
Страница 318: ...Chapter 30 Remote Management VMG5313 B10A B30A Series User s Guide 318 ...
Страница 322: ...Chapter 32 TR 064 VMG5313 B10A B30A Series User s Guide 322 ...
Страница 332: ...Chapter 36 Log Setting VMG5313 B10A B30A Series User s Guide 332 ...
Страница 335: ...Chapter 37 Firmware Upgrade VMG5313 B10A B30A Series User s Guide 335 Figure 176 Error Message ...
Страница 336: ...Chapter 37 Firmware Upgrade VMG5313 B10A B30A Series User s Guide 336 ...
Страница 352: ...Chapter 40 Troubleshooting VMG5313 B10A B30A Series User s Guide 352 ...
Страница 353: ...353 PART III Appendices Appendices contain general information Some information may not apply to your device ...
Страница 354: ...354 ...
Страница 374: ...Appendix B Wireless LANs VMG5313 B10A B30A Series User s Guide 374 ...
Страница 390: ...Appendix E Legal Information VMG5313 B10A B30A Series User s Guide 390 ...