H.248 Features Supported by the Device
This topic describes the H.248 features supported by the device, the related specifications, and supplementary services.
Using an H.248 AG as a Voice Gateway
- A Plain Old Telephone Service (POTS) user connects to the H.248 AG through the PSTN. The H.248 AG converts analog signals into digital signals and compresses and packetizes the digital signals so that the voice packets can be transmitted on the IP network.
- Voice packets are transmitted to the H.248 AG of the called party through the IP network. The H.248 AG of the called party converts the voice packets into analog voice signals and transmits them to the terminal of the called party through the PSTN.
Voice Services Supported by the H.248 AG
The H.248 AG supports the basic voice service and developed services such as the three-party service and call waiting service. These services need to be configured on the softswitch.
Service Type |
Introduction |
|---|---|
Basic voice service |
The basic voice service provides call connections, including intra-office calls, local calls, national long-distance calls, international long-distance calls, and transit calls. |
Three-party service |
The third-party service allows a calling party or called party in a conversation to call a third party without ending the current conversation. Then the calling party or original called party can make a three-party conversation or talk to the other two parties separately. |
Call waiting |
If user C calls user A when user A is talking with user B, user A hears a call waiting tone indicating that there is an incoming call. |
MWI service |
The message waiting indicator (MWI) service allows a user to read unread or leave messages. When the called user is busy, the MWI is on indicating that there are messages. |
Malicious call identification (MCID) service |
The MCID service allows users to perform certain operations to find the phone number of an attacker that initiates malicious calls. |
Call transfer service |
The call transfer service allows the called party to transfer an incoming call to a third party by pressing the hookflash so that the calling party establishes a connection with a new called party. |
Call conference service |
The call conference service allows more than three parties to talk to each other. |
Calling line identification presentation (CLIP) service |
The CLIP service displays the calling number in onhook state or offhook state (for call waiting). The displayed information includes the phone number, name, date, and time. |
Calling line identification restriction (CLIR) service |
The CLIR service shields the calling number on the terminal of a called party. |
Distinctive ringing service |
The distinctive ringing service plays different ring tones for incoming calls from different calling parties. |
Differentiated ringback tone service |
The differentiated ringback tone service plays different ringback tones for different users. |
Advice of charge (AoC) service |
The AoC service displays the charge rate, fee notification during a call, and total fee of the call. |
Emergency call process |
If the H.248 AG detects an emergency call, it inserts an emergency call flag into the H.248 message. |
Completion of Calls to Busy Subscriber (CCBS) service |
The CCBS service enables the H.248 AG to monitor the called party status when the called party is busy. When the called party is idle, the H.248 AG notifies the calling party so that the calling party can determine whether to make a call to the called party again. |
Multiple MSN numbers on a POTS interface |
Multiple MSN numbers can be configured on a POTS interface. |
Hotline service |
The hotline service is classified into:
|
Anonymous call service |
The anonymous call service prevents the called party from viewing information about incoming calls. |