# Using Cisco 7900/8800/9900 phones

This page reorganizes the operational steps for **Using Cisco 7900/8800/9900 phones**.

Standard asterisk support for these legacy phones is not complete, so it is needed to apply a series of patches:

http://usecallmanager.nz/sip-conf.html

## Current Verification

After applying the change, verify the related MiRTA PBX page, the Asterisk logs, and the relevant Status menu entry. Recheck tenant selection before testing tenant-specific behavior.