support wideband in the SIP stack

[Seongryong Kim]

I am trying to make a lightweight VoIP phone with Bluetooth HFP support.
For me, ESP32 is the best solution, and even ESP32 provides a VoIP example. Thank you very much.

The only thing that is unfortunate in the SIP Stack you provided is that wideband is not supported.

#1
I am wondering if there is a plan to add Codec supporting Wideband to the provided SIP Stack.
ex> G.722, Speex, Opus, etc...

# 2
I am wondering if wideband support is not possible due to the performance problem of ESP32.

# 3
If you don't plan on adding a Wideband Codec, can you get the ESP32 SIP Stack source and use it for us to modify?