Installation guide

DSP resources and licensing for IP telephony resources 28-6
Chapter 28: Understanding Wave IP Telephony
Wave Global Administrator Guide
DSP resources required in scenarios with IP phones
The DSPs required for phone calls involving IP phones may vary depending on how many IP
phones are involved in the call.
In the first two examples illustrated below, two DSPs are required for each call, but only one
DSP is required on the Wave Server itself, since there is a DSP in the IP phone.
The following diagram shows an IP phone call to a device on the PSTN:
The following diagram shows an IP phone call to a phone connected to the Wave Server:
The following diagram shows the DSPs required to make a call between two IP phones on the
Wave Server. Note that no IP telephony resources are required on the Wave system in this
scenario.
PSTN
IP phone 101
555-1212
Wave ISM
DSP
packets
voice
signal
voice
signal
DSP
IP phone 101
102
Wave ISM
DSP
packets
voice
signal
DSP
IP phone 101
Wave ISM
packets
DSP
IP phone 103
DSP
packets
Release 2.0
September 2010