Mensual: January 2011

SIP ALG
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Zyxel equipment is often deployed by DSL providers such as Qwest and Century Link.  If you are using a VOIP telephone and experiencing call control or audio issues you may need to disable the SIP ALG feature. 1. Telnet into the router from your LAN. 2. Select menu 24. 3. Select menu 8. 4. To […]

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SIP ALG
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Most late-model Netgear routers have a SIP ALG built in. This setting is enabled by default.  When using a VOIP provider who utilizes an SBC (voice firewall) you may need to disable this setting. Here is how to disable the SIP ALG : 1. Log into the router. 2. On the left side of the screen […]

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SIP ALG
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Most ASAs will have the “inspect sip” statement listed in the default policy-map.   Some service providers will recommend disabling this feature. 1. Log into the ASA through SSH, telnet or the console. 2. Once authenticated, move into “enable mode” by typing “enable”. ================================ ASA> enable Password: ================================ 3. Enter your password. 4. Type “show run […]

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SIP ALG
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I have come across a number Linksys BEFSR41 routers that have a SIP ALG enabled on them. I have not been able to narrow this down to a specific firmware. When looking at the admin interface it doesn’t specifically state anything about the ALG feature.  When looking a packet capture however, the SDP has clearly […]

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