3Com 3C892 manual Limitations of Isdn Ordering Codes U EZ-ISDN 1, V

Supplementary Voice Features Included with U, EZ-ISDN-1, V and EZ-ISDN 1A 119

Supplementary Voice Features Included with U, EZ-ISDN-1, V and EZ-ISDN 1A

Package U or EZ-ISDN 1 includes automatic support on telephone number 1 for the following supplementary voice features, which are also supported by the ISDN LAN Modem:

■Call Waiting

■Call Conference (or Three-Way Calling)

■Call Transfer

■Call Forwarding

■Caller ID

Package V or EZ-ISDN 1A includes automatic support on telephone number 1 for all of the above features, plus Voice Mail.

For the purposes of ordering your ISDN line, Packages U and EZ-ISDN 1 are equivalents. Both offer support for the same set of supplementary voice services. In some regions you will encounter the term IOC U or Package U; in others, you will encounter the term EZ-ISDN 1.

Packages V and EZ-ISDN 1A are also equivalents. They differ from U and EZ-ISDN 1 only by the addition of Voice Mail to the list of their services.

Limitations of ISDN

Ordering Codes U,

EZ-ISDN 1, V and

EZ-ISDN 1A

Simultaneous Voice and

Data on the Same

Telephone Number

Although IOC U, EZ-ISDN 1, V and EZ-ISDN 1A are the ISDN Ordering Codes which will best allow you to take advantage of the ISDN LAN Modem’s supplementary voice features, certain limitations do exist in the way your ISDN line is provisioned under them, as described here:

■Under U, EZ-ISDN 1, V and EZ-ISDN 1A, support for simultaneous voice and data on the same telephone number is not provided. This means that while you are on a circuit-switched data call, you will not be able to place or receive a telephone or fax call on telephone number 2. A circuit-switched data call always uses telephone number 2 for the first B channel; therefore, whenever you are on a data call, telephone number 2 becomes unavailable for incoming or outgoing voice calls (telephone or fax). Telephone number 1, however, will remain available for a voice call while you are on a data call.

When your ISDN LAN Modem is set to its default settings, telephone number 1 is routed to Port 1 as a telephone line, while telephone number 2 is routed to Port 2 as a fax line. If a data call is launched to the Internet, you will be able to receive a telephone call but not a fax call while you are connected. Likewise, if a fax happens to come in while you are dialing in to the Internet, you will be unable to place the call to the Internet.

If you must have simultaneous data and voice capability on the same telephone number, refer to the section, “If You Must Have Simultaneous Voice and Data Capability on Both Numbers.”

For a complete list of the capabilities of ISDN Ordering Codes U, EZ-ISDN 1, V, and EZ-ISDN 1A, refer to “Table of ISDN Ordering Code Capabilities.”