Description:
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SIP ALG (Application Layer Gateway) is a feature which is enabled by default in most Cisco routers running Cisco IOS software and inspects VoIP traffic as it passes through and modifies the messages on-the-fly. For our Hosted VoIP service, including our Single User services, SIP ALG must be disabled on your Cisco router. This article will show you how to
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Methods:
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Log onto the router's terminal (command line interface) via telnet, SSH or serial console
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See Article: Cisco Firewalls