An access code is a sequence of digits that the system must prepend to a telephone number in order to dial it.
For example, many PBX systems require you to dial a 9 to get an outside line for a local call. In this situation, 9 is the local access code—it is the number that you prepend to a telephone number.
The access codes in use at your facility are determined by they way your PBX is set up. When you configure Vocera, you need to identify these access codes so the telephony server can communicate properly with the PBX.
Your PBX may use many different access codes. For example, it may require different access codes to get an outside line for local calls, to get an outside line for toll calls, and to access your company's voicemail system.