Re: Disable SIP ALG on cisco 9800 wlc

Sanjeev_Joshi · ‎02-14-2025

I am having issue in my Voice WLAN while calling and I want to disable SIP ALG on the WLC. Can someone please help me how to do it.

Flavio Miranda · ‎02-14-2025

@Sanjeev_Joshi

There is not such thing on the WLC 9800. Application Layer Gateway is usually configured on routers or voip system.

Leo Laohoo · ‎02-14-2025

Read this: Cisco Wireless IP Phone 8821 and 8821-EX Deployment Guide

This should help configure the Voice SSID as well as fine-tune the settings of the 9800.

Scott Fella · ‎02-15-2025

Depending on what vendor you are using, you should also look or ask their engineer, what is the best practice for wireless configuration. They should have something.

-Scott
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Rich R · ‎02-15-2025

What exactly is the "issue" you are having @Sanjeev_Joshi ?

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TAC recommended codes for AireOS WLC's and TAC recommended codes for 9800 WLC's
Best Practices for AireOS WLC's, Best Practices for 9800 WLC's and Cisco Wireless compatibility matrix
Check your 9800 WLC config with Wireless Config Analyzer using "show tech wireless" output or "config paging disable" then "show run-config" output on AireOS and use Wireless Debug Analyzer to analyze your WLC client debugs
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Field Notice: FN70479 AP Fails to Join or Joins with 1 Radio due to Country Mismatch, RMA needed
How to avoid boot loop due to corrupted image on Wave 2 and Catalyst 11ax Access Points (CSCvx32806)
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Leo's list of bugs affecting 2800/3800/4800/1560 APs
Default AP console baud rate from 17.12.x is 115200 - introduced by CSCwe88390