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Voice Feature Guide 01

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Configuring the VoIP ISDN PRA Service (H.248-based)

Configuring the VoIP ISDN PRA Service (H.248-based)

This topic describes how to configure the VoIP ISDN PRA service on an IP network. When the Access node uses the H.248 protocol, the device supports the access of the ISDN PRA user. ISDN provides end-to-end (E2E) digital connection and supports multiple types of voice and non-voice telecom services.

Prerequisites

According to the actual network, a route from the Access node to the MGC must be configured to ensure that the Access node communicates with the MGC normally.

Context

  • The voice over IP (VoIP) service uses the IP packet switched network for transmission after the traditional analog voice signals are compressed and packetized. This service lowers the cost of the voice service. For the detailed description of the VoIP service, see Voice Feature in the Feature Description.
  • Defined by the International Telegraph and Telephone Consultative Committee (CCITT), the ISDN is a communication network evolved from the Integrated Digital Network (IDN). The ISDN service provides the E2E digital connection and supports multiple types of voice and non-voice telecom services. On the ISDN network, users can access the network through the following two interfaces: (The ISDN technology provides two types of user-network interfaces based on the user-network interface reference model.)
    • ISDN basic rate interface (BRI), which supports a rate of 144 kbit/s and provides two B channels (for carrying services) and one D channel (for transmitting call control signaling and maintenance and management signaling). The rate of B channels is 64 kbit/s and the rate of D channel is 16 kbit/s. The service carried on the ISDN BRI is the ISDN basic rate access (BRA) service.
    • ISDN primary rate interface (PRI), which supports a rate of 2.048 Mbit/s and provides 30 B channels and one D channel. The rates of the B channel and D channel are both 64 kbit/s. The service carried on the ISDN PRI is the ISDN primary rate access (PRA) service.

Precaution

The media gateway control protocol (MGCP) is a master/slave protocol, under which the MGC controls the AG to implement the call connection. The data on the AG for the interconnection with the MGC, such as the attributes of the MG interface and the attributes of the VoIP user, must be the same as the corresponding data on the MGC. Therefore, before configuring the VoIP service, you must contact MGC engineers to check and ensure that the interconnection data plan for the AG is consistent with the corresponding plan for the MGC.

Data preparation

Table 1-45 provides the data plan for configuring the H.248-based VoIP ISDN PRA service.
Table 1-45 Data plan for configuring the H.248-based VoIP ISDN PRA service

Item

Remarks

MG interface data

(The data must be consistent with the data on the MGC.)

Parameters of the media stream and signaling stream

Upstream VLAN for media and signaling streams

It is used for the upstream VLAN of the VoIP service to be configured. Standard VLAN is recommended.

Uplink port for media and signaling streams

It is used as the uplink port for the VoIP service to be configured.

Media IP address and signaling IP address

These IP addresses must be contained in the media and signaling IP address pools. The media and signaling IP address pools consist of all the IP addresses of the Layer 3 interface of the upstream VLAN for media and signaling streams.

Default IP address of the MG

It is the next hop IP address from the Access node to the MGC.

Attribute parameters of the MG interface

NOTE:

Parameters listed here are mandatory, which means that the MG interface cannot be enabled if these parameters are not configured.

MG interface ID

It is the ID of the MG interface used by the VoIP service to be configured. The Access node supports only one VAG.

Signaling port ID of the MG interface

It is the transport layer protocol port ID used for the signaling exchange between the Access node (AG) and the MGC.

The default signaling port ID defined in H.248 is 2944 (text) and 2945 (binary).

IP address of the primary MGC to which the MG interface belongs

When dual homing is not configured, you can configure the parameters of only the primary MGC. When dual homing is configured, you also need to configure the IP address and port ID of the secondary MGC.

Port ID of the primary MGC to which the MG interface belongs

Coding mode of the MG interface

Currently, only the text mode is supported.

Transmission mode of the MG interface

The transmission mode is selected according to the requirements of the MGC. Generally, UDP is used.

Domain name of the MG interface

It corresponds to the domainName parameter of the MG interface.

When the H.248 protocol is used, this parameter must be configured if the MIDType parameter of the H.248 message is configured to domainName. Otherwise, the MG interface cannot be started. In other situations, this parameter is optional.

Device name of the MG interface

It is supported by only the H.248 protocol, and it corresponds to the deviceName parameter of the MG interface that uses the H.248 protocol.

This parameter must be configured if the MIDType parameter of the H.248 message is configured to domainName. Otherwise, the MG interface cannot be started. In other situations, this parameter is optional.

Software parameters of the MG interface

Whether the MG interface supports the functions such as dual homing and emergency standalone is determined by the service requirements.

Terminal ID (TID) format of the MG interface

The TID format determines the generation mode of various types of user terminals on an MG interface.

IUA link

IUA link set

The IUA link can be configured only after the IUA link set is configured.

IUA link

NOTE:

The local port ID, local IP address, remote port ID, and remote IP address of different links must not be completely same; otherwise, the service cannot be configured.

IUA link ID

It indicates the link for transmitting the signaling.

IUA link set ID

-

Local port ID

To activate the link normally, it must be the same as the remote port ID configured on the MGC.

Local IP address

It must be the same as the remote IP address of the link configured on the MGC. In addition, the local IP addresses of the links that are in the same link set must be the same. (The IP address must exist in the media IP address pool.)

Remote port ID

To activate the link normally, it must be the same as the local port ID configured on the MGC.

Remote IP address

It must be the same as the local IP address of the link configured on the MGC. The SCTP protocol supports the multi-homing function. That is, one link can be configured with the IP addresses of multiple MGCs as the remote IP addresses. When one MGC is faulty, the link can be switched to other MGCs automatically. This ensures that the service is not affected. The Access node supports the configuration of the active remote IP address and standby remote IP address.

ISDN PRA user data

(The data must be consistent with the data on the MGC.)

Slot that houses the E1 service board

-

User data

Termination ID

If the TID format bound to the PRA user does not support terminal layering function, this parameter needs to be configured, and the configuration must be consistent with the configuration on the MGC.

User priority

The user priority must be specified according to the service requirements. There are three categories of user priorities, which are as follows:

  • cat1: government1 (category 1 government user)
  • cat2: government2 (category 2 government user)
  • cat3: normal (common user, default)

Interface ID

It indicates the interface for the PRA user data to pass through the MG and MGC. The configuration of this parameter must be consistent with the corresponding configuration on the MGC.

System parameters

The system parameters including the oversea version flag and message waiting indication (MWI) mode need to be configured according to local standards to ensure that the response of the user terminal complies with local standards.

Overseas parameters

The attributes such as the upper and lower thresholds of the flash-hooking duration need to be configured according to local standards to ensure that the response of the user terminal complies with local standards.

E1 port attributes

The attributes include the access mode of the board, port mode, line coding mode, and port impedance. Generally, if there is no requirement, these attributes need not be modified.

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Updated: 2019-02-22

Document ID: EDOC1100067358

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