Basic voice features

Table 1 Basic voice features

Basic Feature	Description
Protocol Voice protocols are used for communication between an access device and an upper-layer gateway control device. The access device supports H.248, Media Gateway Control Protocol (MGCP), and Session Initiation Protocol (SIP). You can run the display protocol support command to query the protocol used on the device. If the protocol used on the device is different from the planned protocol, run the protocol support command to switch the protocol.	SIP H.248 MGCP
Access Mode A voice access mode is based on terminal type and service requirements. The access device supports POTS, ISDN, and R2 access modes. Voice communication also supports fax and modem services. A POTS network is a connection-oriented circuit switched network based on timeslot switching. Each circuit connection uses a timeslot in a pulse code modulation (PCM) group. That is, the circuit switched rate is 64 kbit/s. The ISDN access can be basic rate access (BRA) or primary rate access (PRA). The BRA access provides 2 B channels and 1 D channel. The rates of B and D channels are 64 kbit/s and 16 kbit/s, respectively. The PRA access provides 30 B channels and 1 D channel. The rates of B and D channels are both 64 kbit/s. In R2 access mode, the access device connects to a private branch exchange (PBX), which communicates with the access device through R2 signaling.	ISDN POTS R2 FoIP MoIP
Key Techniques for Improving Voice Service Quality The VoIP technology provides a series of technologies, such as codec, echo cancellation (EC), and voice activity detector (VAD) to improve the voice quality.	Key Techniques for Improving Voice Service Quality

Table 2 Voice service features

Service Type	Description
VoIP The VoIP service uses the IP packet switched network for transmission after the traditional analog voice signals are compressed and packetized, to lower the cost of the voice service.	For the SIP protocol: SIP-based VoIP Principle Configuring the VoIP PSTN Service (SIP-based) Configuring the VoIP BRA Service (SIP-based) Configuring the VoIP PRA Service (SIP-based) Configuring the VoIP R2 Service (SIP-based)
	For the H.248 protocol: H.248-based VoIP Principle Configuring the VoIP PSTN Service (H.248-based) Configuring the VoIP BRA Service (H.248-based) Configuring the VoIP PRA Service (H.248-based) Configuring the VoIP R2 Service (H.248-based)
	For the MGCP protocol: MGCP-based VoIP Principle Configuring the VoIP PSTN Service (MGCP-based)
MoIP The modem over Internet Protocol (MoIP) refers to the modem service provided on the IP network or between the IP network and the traditional PSTN network.	For the SIP protocol: SIP-based MoIP Principle Configuring the MoIP Service (SIP-based)
	For the H.248 protocol: H.248-based MoIP Principle Configuring the MoIP Service (H.248-based)
	For the MGCP protocol: MGCP-based MoIP Principle Configuring the MoIP Service (MGCP-based)
FoIP The fax over Internet Protocol (FoIP) refers to the fax service provided on the IP network or between the IP network and the traditional PSTN network.	For the SIP protocol: SIP-based FoIP Principle Configuring the FoIP Service (SIP-based)
	For the H.248 protocol: H.248-based FoIP Principle Configuring the FoIP Service (H.248-based)
	For the MGCP protocol: MGCP-based FoIP Principle Configuring the FoIP Service (MGCP-based)
Line hunting Line hunting is a feature that allows a group of ports to share a group of called party numbers by specifying a hunting group and hunting policy. Only the SIP protocol supports this feature.	Line Hunting Principle Configuring Line Hunting
POTS IP SPC To configure an IP SPC, configure the data (including the local IP address, local UDP port, remote IP address, and remote UDP port), set up an IP direct connection between the two ends of the voice service. In this manner, the voice media data can be directly transmitted to the peer end.	POTS IP SPC Adding a POTS IP SPC

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