Update request:

Can anyone here confirm that by disabling the iLBC codec, that you are able to make calls via voipbuster/voipdiscount AND Gizmo SIP accounts?

Based on my understanding, you can either have VoipBuster/Voipdiscount working OR Gizmo/Skype working, but not both without needing to run a script to toggle the iLBC codec on/off.

Can someone confirm this?

UPDATE:

with iLBC disabled, I can still make Skype calls and Voipbuster calls. Gizmo is a no go with iLBC switched off.