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Appendix M SIP
NN47922-501
If the primary WAN connection fails, the SIP client needs to re-register with the
SIP server through the secondary WAN port to have the SIP connection go
through the secondary WAN port.
When the Business Secure Router uses both of the WAN ports at the same time,
you can configure a routing policy to have the voice traffic from any IP address
with UDP port 5060 and the RTP ports go over a specified WAN port.
Enabling or disabling the SIP ALG
The Business Secure Router SIP ALG is turned off by default to avoid
retranslating the IP address of an existing SIP device that is using STUN. If you
want to use a SIP client device (a SIP phone or IP phone for example) behind the
Business Secure Router without STUN, use the
ip alg enable ALG_SIP
command to activate the SIP ALG.
Signaling session timeout
Most SIP clients have an expire mechanism indicating the lifetime of signaling
sessions. The SIP UA sends registration packets to the SIP server periodically and
keeps the session alive in the Business Secure Router.
If the SIP client does not have this mechanism and makes no call during the
Business Secure Router SIP timeout default (60 minutes), the Business Secure
Router SIP ALG drops any incoming calls after the timeout period. You can use
the
ip alg siptimeout
command to change the timeout value.
Audio session timeout
If no voice packets go through the SIP ALG before the timeout period default (5
minutes) expires, the SIP ALG does not drop the call but blocks all voice traffic
and deletes the audio session. You cannot hear anything and you must make a new
call to continue your conversation.
Summary of Contents for 222
Page 14: ...14 Contents NN47922 501 ...
Page 24: ...24 Tables NN47922 501 ...
Page 30: ...30 Preface NN47922 501 ...
Page 46: ...46 Chapter 2 Introducing the SMT NN47922 501 SMT menus at a glance Figure 6 SMT overview ...
Page 70: ...70 Chapter 3 WAN and Dial Backup Setup NN47922 501 ...
Page 78: ...78 Chapter 4 LAN setup NN47922 501 ...
Page 100: ...100 Chapter 6 Remote Node setup NN47922 501 ...
Page 104: ...104 Chapter 7 IP Static Route Setup NN47922 501 ...
Page 132: ...132 Chapter 9 Network Address Translation NAT NN47922 501 ...
Page 154: ...154 Chapter 11 Filter configuration NN47922 501 ...
Page 158: ...158 Chapter 12 SNMP Configuration NN47922 501 ...
Page 198: ...198 Chapter 15 Firmware and configuration file maintenance NN47922 501 ...
Page 212: ...212 Chapter 17 Remote Management NN47922 501 ...
Page 232: ...232 Appendix B Triangle Route NN47922 501 ...
Page 252: ...252 Appendix D PPPoE NN47922 501 ...
Page 260: ...260 Appendix F Hardware specifications NN47922 501 ...
Page 270: ...270 Appendix G IP subnetting NN47922 501 ...
Page 308: ...308 Appendix H Command Interpreter NN47922 501 ...
Page 312: ...312 Appendix I NetBIOS filter commands NN47922 501 ...
Page 336: ...336 Appendix L Brute force password guessing protection NN47922 501 ...