= Checking that Microphone and Speaker are Functioning Properly =

The easiest way to check if both microphone and speaker are functioning properly is by using pjsua and looping the microphone to the speaker in the conference bridge:

 1. run pjsua, e.g:
    - for desktop, {{{pjsua}}} sample app is automatically built, so simply run it from console:
{{{
 $ ./pjsua
}}}
    - for mobile platforms, {{{pjsua CLI}}} sample app usually need to be built manually (check [wiki:Getting-Started] wiki of the platform, e.g: [https://trac.pjsip.org/repos/wiki/Getting-Started/Android#pjsua here] for Android, or [https://trac.pjsip.org/repos/wiki/Getting-Started/iPhone#BuildingPJSIP here] for iOS), run it on the device and start a telnet session to {{{pjsua CLI}}} app running on the device from desktop console, e.g:
{{{
 $ telnet 192.168.1.101 2323
}}}
      Wait until telnet session is established. Check [https://trac.pjsip.org/repos/wiki/PJSUA-CLI here] for more info about pjsua CLI.

 2. loopback microphone to the speaker:
{{{
>>> cc 0 0
}}}

 3. Done

Now whatever captured in your microphone will be played-back locally to your speaker. 

== Note ==
This step is not recommended for PDA application since on PDA, the echo suppressor will cut the microphone signal once it detects that something is playing in the speaker.