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13.7.2 |
Features of IP Networking |
Transparency for End Users |
| • | Special workpoint clients (terminals) are not required because voice data is not converted into IP packages in the workpoint client, but rather in the LAN gateway. |
| • | Network-wide features are transferred which means that use of the workpoint clients has not changed and consequently, the user-friendliness of the telephone has not been affected. |
| • | DTMF signals are supported. Consequently, you can perform suffix-dialing or listen to your voicemail over the IP network. |
Fax (Group 3) and analog Modem as well as Data Transmission with X.75 over IP |
| Implementation of the integrated router HG 1500 means that analog fax and modem connections as well as data connections of the type X.75 can be transmitted between IP-networked communications platforms without the need for additional hardware. The system recognizes the connection type required on the basis of the configured station type (fax, modem or speech) and automatically establishes a connection in the IP network. |
| The following connection types are supported: |
| • | Realtime fax transmission is supported in accordance with the ITU-T standard T.30 (fax group 3). Faxes are transmitted between the networked communications platforms at a maximum speed of 14.4 kbps (V.17). |
| • | Data can be transmitted via modem over the IP network at a speed of 33.6 kbps using the ITU-T standard V.42. |
| • | Data transmission to the ITU-T standard X.75 |
Support of Network-wide Features |
| The CorNet N protocol is supported for IP networking. which means that CorNet-N-specific features are transmitted over the IP network (tunneling). |
| The following applies: Overall, the features that are transmitted today in the HiPath 3000/5000 Corporate Network, are also transmitted in the IP network although the old network has been enhanced in certain respects (see Section 13.7.3 "Network-Wide Features with IP Networking"). |
Central Attendant Console |
| A central, system-wide attendant console can be configured within the IP network. The network-wide busy signal option is possible here. |
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Automatic Routing |
| Automatic routing to a backup or alternative network can be executed for new connections. A voice network (ISDN, for example) can also operate as a backup network. This ensures that the high availability of the HiPath 3000/5000 will not be affected when IP networks are being used by voice and fax connections. Automatic routing is initiated if |
| • | the communications platform called is not available (due to faults or an overload in the IP network for example). |
| • | No further capacity available for LAN access (maximum number of B channels for LAN gateway exceeded). |
| • | explicitly requested for connections (fax or modem connections, for example). |
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Standard Numbering Plan |
| Telephone numbers are converted into the IP addresses of the remote communications platform (HiPath 3000) within the LAN access (HG 1500). A "routing table" which assigns the correct IP address to each destination call number or destination node number must be created to ensure that the IP address of the correct target node is implemented. |
| A network with either open or closed numbering should be configured for this purpose. When using closed numbering, each station number in the network can have up to seven digits whereas in open numbering, the node number + station number together must not exceed seven digits. |
Standard Compliance |
| • | Connection protocol |
| "Voice over IP" to ITU H.323 |
| • | Voice transmission - Audio Codecs |
| - | ITU G.711 |
| - | ITU G.723.1 |
| - | ITU 6.729 |
| • | Echo suppression |
| in accordance with ITU-T G.165 |
| • | Prioritization of data - Quality of Service (QoS) |
| - | IEEE 802.1d |
| - | RFC2474 Differentiated Services (DiffServ) |
| - | RFC791 Type of Service (TOS) |
| HiPath 3000/5000 V9, Service Documentation, Issue 7 | up  |
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| Disclaimer & Copyright | ID: P31003H3590S100017620 | 2012-06-25 |