Specifying the Companding Algorithm (mu-law or A-law)

By default, the Vocera SIP Telephony Gateway first offers the G.711 mu-law companding algorithm, a standard for converting analog data into digital form using pulse code modulation in North America and Japan. For European locales, you can switch to offering the G.711 A-law companding algorithm first in the list by specifying the following property:

VTGUseALaw = true

For outbound traffic, Vocera SIP Telephony Gateway uses the VTGUseALaw property to set the orders of the codecs for negotiation with the IP PBX, and then it adjusts to the codec that the IP PBX offers. If VTGUseALaw is set to FALSE (the default), G.711 mu-law is offered first. Otherwise, G.711 A-law is offered first in the list.

For inbound traffic, Vocera SIP Telephony Gateway converts the audio to G.711 mu-law codec before sending it to the Vocera Voice Server.