Tags: SIP ALG
==================== FortiOS has two features that can modify the SIP headers and SDP parameters. The first feature is called the “SIP Session Helper”. If you are experiencing one way audio issues disable this feature first, reboot your IP phone then try making another call. If disabling the session helper does not work, disable the SIP […]
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MásTo disable the SIP ALG on a DLINK DIR-625 follow the below steps. 1. Log into the router. The default user name on this model is “Admin” with a blank password. 2. Click on “Advanced” at the top of the screen. 3. Click on “Firewall Settings” on the left. 4. Scroll down toward the bottom. […]
MásZyxel 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 […]
MásSonicOS has a feature called SIP Transformations that may cause issues with your VOIP end points. Providers will often ask you to disable this setting if you are experiencing call control or quality issues. To disable SIP Transformations: 1. Log into the web interface on the SonicWall. 2. On the left, find the VOIP tab. […]
MásMost 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 […]
MásI 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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