User guide

4-1
Telesyn Service Guide (Optimizing Voice Services)
4. Optimizing Voice Services
4.1 Overview
Voice service can be provided with the following configurations:
• POTS with a call agent using the POTS24 card
In this configuration, the POTS24 card supports VoIP using Media Gateway Control Protocol (MGCP) as the
call control protocol to the network gateway as defined in the Line Control Signalling (LCS) architecture. The
Telesyn POTS24 card transforms analog POTS calls into IP packets and forward these packets onto an Ether-
net network. The network gateway accepts these packets and forwards them to a Class 5 switch via GR-303
trunks.
Furthermore, the POTS24 supports the use of RFC2833 to signal Robbed Bit Signalling (RBS) events when
requested by the Internet Protocol Digital Terminal (IPDT, the LCS representation of the MGC or call agent).
Line signaling events are sent to the IPDT by the POTS24 for on-hook and off-hook events detected on its
lines. Likewise, the IPDT will signal RBS events to the POTS24 in order to condition its lines to facilitate call
management (for example, external ringback)
to connect to a phone (or modem or fax machine), and is embedded in ethernet.
• Derived Voice
In this configuration, the Residential Gateway provides the same functionality as the POTS24 card and Tele-
syn device; it can then connect to a Telesyn device or directly to the network. The connection to the network
gateway over GR-303 trunks is the same.
In this section, each configuration is described separately.
4.2 POTS Only with Call Agent (POTS24 Card)
4.2.1 Overview
Figure 4-1 shows the physical configuration of Voice call processing using the POTS24 card and Call Agent.
The analog loop is converted to and ethernet uplink and then connected with the network.
Note: This figure also shows that the POTS24 card can be used for data services, such as a pc or
fax, since it can connect to a dial-up analog modem.