User guide

Chapter 4: Configuring your VOIP
Multi-Tech Systems, Inc. 41
SPP
Single Port Protocol was developed by Multi-Tech to allow for dynamic IP addressing when it is set to
Registrar/Client mode. The other choice, Direct mode, has IP addresses assigned to the gateways. The
table below describes all fields in the general SPP Call Signaling screen.
Figure 4-17: SPP call signaling