340
Appendix L SIP
NN47923-501
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.
Содержание 252
Страница 13: ...Contents 13 Nortel Business Secure Router 252 Configuration Advanced SIP Register Server 337 RTP 337 Index 341 ...
Страница 14: ...14 Contents NN47923 501 ...
Страница 20: ...20 Figures NN47923 501 ...
Страница 24: ...24 Tables NN47923 501 ...
Страница 30: ...30 Preface NN47923 501 ...
Страница 42: ...42 Chapter 1 Getting to know your Nortel Business Secure Router 252 NN47923 501 ...
Страница 48: ...48 Chapter 2 Introducing the SMT NN47923 501 SMT menus at a glance Figure 6 SMT overview ...
Страница 72: ...72 Chapter 3 WAN and Dial Backup Setup NN47923 501 ...
Страница 80: ...80 Chapter 4 LAN setup NN47923 501 ...
Страница 84: ...84 Chapter 5 Internet access NN47923 501 ...
Страница 98: ...98 Chapter 6 Remote Node setup NN47923 501 ...
Страница 102: ...102 Chapter 7 IP Static Route Setup NN47923 501 ...
Страница 130: ...130 Chapter 9 Network Address Translation NAT NN47923 501 ...
Страница 156: ...156 Chapter 12 SNMP Configuration NN47923 501 ...
Страница 178: ...178 Chapter 14 System information and diagnosis NN47923 501 ...
Страница 198: ...198 Chapter 15 Firmware and configuration file maintenance NN47923 501 ...
Страница 212: ...212 Chapter 17 Remote Management NN47923 501 ...
Страница 232: ...232 Appendix B Triangle Route NN47923 501 ...
Страница 252: ...252 Appendix D PPPoE NN47923 501 ...
Страница 256: ...256 Appendix E Hardware specifications NN47923 501 ...
Страница 266: ...266 Appendix F IP subnetting NN47923 501 ...
Страница 308: ...308 Appendix H NetBIOS filter commands NN47923 501 ...
Страница 332: ...332 Appendix K Brute force password guessing protection NN47923 501 ...