Westell

 

 

 

 

 

 

What is an IiQ 2030?

The IiQ 2030 gateway allows PBXs to communicate efficiently with one another across Local and Wide Area data Networks. This integration saves on costly separate communications trunks. Additionally, the IiQ 2030 gateway enables traditional phones attached directly to the PBX to communicate with IP phones on the LAN.

 

 

 

 

Using the IiQ2030, can I add IP telephony to a network of DPNSS PBXs already communicating using IP?

Yes. If the IP telephony system has a H.323 interface, then an IiQ 2030 is used to convert the DPNSS traffic coming from the legacy PBX(s). This configuration allows each PBX to talk not only to other PBX / IiQ2030 combinations, but any H.323 devices simultaneously.

 

 

 

 

 

Does the IiQ 2030 support DPNSS services across an IP network?

IiQ 2030 supports all DPNSS basic call features as described in BTNR 188 Issue 6, sections 4 to 7, plus supplementary services when running transparently between two or more gateways.

 

 

 

 

 

How many IP addresses does the IiQ 2030 require?

The IiQ 2030 requires two IP addresses. Westell’s product design provides a decomposed gateway, which consists of distinct IP addresses used for signalling and voice paths. All management information flows use the signalling gateway IP address.

 

 

 

 

 

How does the IiQ 2030 convert from DPNSS to H.323?

The IiQ 2030 has 2 modes of working:
i. Interworking - this allows basic call signalling and calling line identity (CLI) to be mapped between DPNSS and H.323. Other supplementary services are not mapped.
ii. Transparency - this allows DPNSS messages to be encapsulated inside of H.323 and passed across the IP network. In this mode all DPNSS functions are supported. Transparency can be used between any endpoints that can decode the transparency element.

 

 

 

 

 

Does the IiQ 2030 affect performance of the network?

Although the traffic generated by H.323 signalling on the data network is negligible, that generated by real-time voice traffic may not be. The loading depends on the number of calls, the compression technique in use for a particular call, and the nature of the call.

 

 

 

 

 

Does the IiQ 2030 affect performance of the legacy telephones?

The quality of service obtained from legacy telephones on the system is governed by the bandwidth and quality of the network, and the codec in use.

 

 

 

 

 

 

Can the IiQ 2030 gateway be configured to work with an external gatekeeper?

Yes, the IiQ 2030 can operate with an external gatekeeper or can be used as a completely stand-alone unit. It has internal functionality to provide address resolution, number manipulation and network routing

 

 

 

 

 

What QoS features are supported in the IiQ 2030 gateway?

The IiQ 2030 supports IP v4 TOS bits and DiffServ.

 

 

 

 

 

Can the gateway support FAX without using T.38?

Yes, the IiQ 2030 can pass fax in clear G.711. In this mode, the IiQ 2030 automatically switches off echo cancellation and locks the jitter buffers. This is done on a call-to-call basis once the fax tones are detected in the voice channel.

 

 

 

 

 

Does the gateway support modem calls?

No, the IiQ 2030 does not support modem calls. However empirical testing has shown that some low speed modems do succeed across G.711, on a good network, up to 14,400 bits/s (v.32 bis).

 

 

 

 

Can you limit the number of calls that go out across the network?

The IiQ 2030 allows DPNSS channels to be sub-equipped, so limiting the number of voice calls from the gateway.