Chapter 18 Voice over 3G
LTE5366 Series User’s Guide
126
18.6 Technical Reference
This section contains background material relevant to the
VoIP
screens.
Vo3G
Vo3G is the sending of voice signals over a 3G mobile network. This allows you to make phone calls and
send faxes over the Internet at a fraction of the cost of using the traditional circuit-switched telephone
network. You can also use servers to run telephone service applications like PBX services and voice mail.
Internet Telephony Service Provider (ITSP) companies provide VoIP service.
Circuit-switched telephone networks require 64 kilobits per second (Kbps) in each direction to handle a
telephone call. VoIP can use advanced voice coding techniques with compression to reduce the
required bandwidth.
SIP
The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol that handles the
setting up, altering and tearing down of voice and multimedia sessions over the Internet.
SIP signaling is separate from the media for which it handles sessions. The media that is exchanged
during the session can use a different path from that of the signaling. SIP handles telephone calls and
can interface with traditional circuit-switched telephone networks.
SIP Identities
A SIP account uses an identity (sometimes referred to as a SIP address). A complete SIP identity is called
a SIP URI (Uniform Resource Identifier). A SIP account's URI identifies the SIP account in a way similar to
the way an e-mail address identifies an e-mail account. The format of a SIP identity is SIP-Number@SIP-
Service-Domain.
SIP Number
The SIP number is the part of the SIP URI that comes before the “@” symbol. A SIP number can use letters
like in an e-mail address ([email protected] for example) or numbers like a telephone number
([email protected] for example).
Rule
Select to turn on or turn off the rule.
Note: If you enable the
All Calls
rule, other rules are not configurable/applicable.
Cancel
Click this to set every field in this screen to its last-saved value.
Apply
Click this to save your changes and to apply them to the LTE5366.
Table 56 Configuration > Application > Voice over 3G > Call Conf. (continued)
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