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Voice Communication
The unified gateway supports basic voice communication, including:
ϒ⁄Intra-office communication
Intra-office users under the unified gateway can use various supported broadband and narrowband terminals to make voice calls to each other. The terminals include analog phones, soft phones, IP phones (SIP), SIP-based Desktop Client, and SIP SoftConsole. Access devices such as the IAD (SIP) are also supported.
ϒ⁄Narrowband trunk-based communication
The unified gateway can be connected to the PSTN or TDM PBX using a digital trunk (E1/T1) or analog trunk (AT0). Intra-office users (either as calling or called parties) can have voice calls with users at the peer end of the narrowband trunk.
Table 1 lists the E1/T1 trunk types supported by the unified gateway.
Table 1 E1/T1 trunk types supported by the unified gateway
Trunk Type |
E1 |
T1 |
PRA |
√ |
√ |
QSIG |
√ |
√ |
An E1 trunk supports a maximum of 30 voice channels, and a T1 trunk supports a maximum of 23 voice channels.
ϒ⁄Broadband trunk-based communication
The unified gateway uses the SIP trunk to connect to the IP PBX, softswitch, or IMS. Voice calls can be made between intra-office users and the users under other devices.
Point-to-Point Multimedia Communication
The unified gateway supports the point-to-point (P2P) multimedia communication service, allowing SIP-based multimedia terminals to communicate with each other.
ϒ⁄Supports the Video Phone 8950.
ϒ⁄Supports P2P video calls between intra-office users and SIP-based P2P video calls between intra-office and outer-office users.
Call Rights Control
The unified gateway allows users to make intra-office calls, local calls, national toll calls, and international toll calls. In addition, a maximum of 32 types of call rights can be defined to restrict users from making specified types of calls.
Number Analysis and Processing
The unified gateway analyzes the calling and called numbers based on their prefix and length to control incoming and outgoing call rights. The calling number is analyzed before the called number. Numbers with the same prefix are analyzed based on the length.
ϒ⁄The unified gateway can analyze and process a regular number or prefix containing a maximum of 32 digits and an intra-office number containing a maximum of 16 digits.
ϒ⁄The unified gateway can analyze a maximum of 1024 calling numbers and a maximum of 2048 called numbers.
ϒ⁄Prefixes can identify emergency, intra-office, local, intra-office and local, national, and international calls, and support 32 levels of customized call rights. The intra-office and local prefixes are applied when the intra-office prefix is the same as the local outgoing prefix.
ϒ⁄The unified gateway can insert, change, or delete digits in calling and called numbers. The length of a changed number cannot exceed the maximum value. A maximum of 1024 change types are supported.
Voice Processing, Encoding, and Decoding
The unified gateway provides the following voice processing capabilities:
ϒ⁄Supports the voice activity detection (VAD), comfort noise generator (CNG), echo cancellation (EC), gain adjustment, jitter buffer, and packet loss compensation (PLC) technologies, providing users with high-quality voice services.
ϒ⁄Supports type of service (ToS) and Differentiated Services Code Point (DSCP) technologies, ensuring that voice streams are preferentially transmitted.
ϒ⁄Supports the Real-Time Transport Control Protocol (RTCP) and provides statistical information about the total numbers of RTP packets sent and received, total numbers of bytes sent and received, delay, jitter, and packet loss rate.
ϒ⁄The unified gateway supports various codecs such as G.711 (A-Law/U-law), G.729a/b, iLBC, G.722, G.722.1, G.722.2, and Opus. In addition, it supports voice codec change and priority selection.
Fax
The unified gateway supports T.30 faxes in the circuit switched domain and T.38 faxes in the packet switched domain, and transparent transmission of G.711 faxes.
ϒ⁄The end-to-end delay for transmitting signals using a fax machine cannot exceed 3 seconds. It is recommended that no more than four T.38 code switching gateways be deployed on the network.
ϒ⁄For transparent transmission, unified gateway supports converting voice calls in G.729 encoding mode into G.711 faxes.
Parent Topic: Functions and Features