User guide

Chapter 4: Configuring your VOIP
Multi-Tech Systems, Inc. 37
Call Signaling
There are three types of Call Signaling available: H.323, SIP and SPP. Each type has some individual features
that may make it more appealing to use than the others, depending on your needs.
H.323
H.323 is an ITU-T recommended set of standards for audio and video communications. The fields for this
screen are defined in the table below.
Figure 4-13: H.323 call signaling