Chapter 17 VoIP
LTE-5121 User’s Guide
181
1
The client device (A in the figure) sends a call invitation to the SIP proxy server B.
2
The SIP proxy server forwards the call invitation to C.
Figure 119
SIP Proxy Server
SIP Redirect Server
A SIP redirect server accepts SIP requests, translates the destination address to an IP address and
sends the translated IP address back to the device that sent the request. Then the client device that
originally sent the request can send requests to the IP address that it received back from the
redirect server. Redirect servers do not initiate SIP requests.
In the following example, you want to use client device A to call someone who is using client device
C.
1
Client device A sends a call invitation for C to the SIP redirect server B.
2
The SIP redirect server sends the invitation back to A with C’s IP address (or domain name).
B
A
C
1
2
Summary of Contents for LTE5121
Page 4: ...Contents Overview LTE 5121 User s Guide 4...
Page 12: ...Table of Contents LTE 5121 User s Guide 12...
Page 13: ...13 PART I User s Guide...
Page 14: ...14...
Page 22: ...Chapter 1 Introduction LTE 5121 User s Guide 22...
Page 28: ...28...
Page 42: ...Chapter 4 Broadband LTE 5121 User s Guide 42...
Page 70: ...Chapter 5 Wireless LTE 5121 User s Guide 70...
Page 98: ...Chapter 7 Static Route LTE 5121 User s Guide 98...
Page 102: ...Chapter 8 DNS Route LTE 5121 User s Guide 102...
Page 114: ...Chapter 9 Quality of Service QoS LTE 5121 User s Guide 114...
Page 138: ...Chapter 14 Parental Control LTE 5121 User s Guide 138...
Page 148: ...Chapter 15 Certificates LTE 5121 User s Guide 148...
Page 151: ...Chapter 16 VPN LTE 5121 User s Guide 151 Figure 104 IPSec VPN Add...
Page 162: ...Chapter 16 VPN LTE 5121 User s Guide 162...
Page 198: ...Chapter 19 User Account LTE 5121 User s Guide 198...
Page 214: ...Chapter 26 Backup Restore LTE 5121 User s Guide 214...
Page 224: ...Chapter 28 Troubleshooting LTE 5121 User s Guide 224...
Page 234: ...Index LTE 5121 User s Guide 234...