Understand requirements for using a hosted or cloud-based telephony system with the
Voice Service in the Vocera Platform .
Connecting VSTG to a Cloud-based Telephony System
VSTG can connect to a SIP trunk on a hosted or cloud-based PBX either directly or through a
SIP gateway configured at the network edge. To successfully connect and interoperate the SIP
trunk used by the VSTG, your telephone system must support the following requirements:
- SIP version 2.0 as specified in RFC 3261.
- RFC 2833 standard Dual Tone Multi Frequency (DTMF) in order to support features such
as paging and dialing Vocera extensions through the guest access number.
- Real Time Protocol (RTP) audio to the VSTG must use the G.711 µ-Law or A-Law codec.
The packet spacing must be 20 milliseconds.
Note: If you experience interoperability challenges with a SIP trunk supporting these
standards, contact Vocera Technical Support for further assistance.
Features Not Supported
The VSTG does not support the following features:
- SIP Trunk Authentication
- SIP Trunk Registration
- NAT Traversal
