iISDN TIP!

In some cases your ISDN line will only have only one phone number for the two B channels. This is the case of the AT&T Custom PTP protocol. It shouldn’t present a problem. The lines work as if they were on a business phone’s “hunt group”: the

t

 

first incoming call on the number is assigned to Line 1, and the second incoming call is

 

 

 

 

assigned to Line 2. Of course you have the option of which line to use on outgoing

 

 

calls.

 

 

 

 

 

 

DEEP TECH NOTE!

 

 

 

The actual 2 B channels of the BRI are assigned on a per call basis. Therefore, from a

 

i

 

theoretically correct viewpoint, Lines 1 and 2 do not fully correspond to B1 and B2.

 

 

 

 

SPIDS

 

 

 

 

 

ISDN TIP!

 

 

 

European users should disregard all references to SPIDs. Euro ISDN does not have

 

 

 

SPIDs! If you want, use the MSNs instead.

 

 

Service Profile Identification numbers (SPIDS) are only required with ZephyrExpress

 

when you are using the National I-1 ISDN or DMS Custom functional ISDN protocols in

 

the USA. This number is given to the user by the phone company and must be entered

 

into ZephyrExpress for the connection to function. SPIDs usually consist of the phone

 

number plus a few prefix or suffix digits.... but they don’t have to. There is frequent con-

 

fusion between telephone numbers and SPIDS, even among Telco personnel. While the

 

SPID frequently includes the corresponding phone number, this is not necessarily the

 

case.

 

If you are using the National I-1 or the DMS Custom functional protocol, your Telco

 

service representative must give you one or two SPID numbers.

 

Upon power-up, connection of the ISDN line, reboot, or protocol change, ZephyrEx-

 

press and the phone company switch go through an initialization and identification

 

routine. ZephyrExpress sends the SPID(s), and if the switch thinks they’re correct com-

 

munication is possible. Thereafter the SPID is not sent again to the switch.

The two line status indicators on the bottom of the status screen will show you how the initialization process is going. Check the screen after ISDN has been connected for thirty seconds orso:

Inact

Inact

means no ISDN connection

 

 

means the ISDN: Switch type doesn’t match the

Init

Init

 

 

phone company’s setup or SPIDs haven’t been en-

 

 

tered.

 

 

Init Init can also appear when a European ISDN

 

 

connection has been idle for a while. This is normal,

 

 

and Ready will appear when you start using the con-

 

 

nection again.

 

 

means incorrect SPID1

Wait

Init

 

 

means only one working ISDN channel

Ready

Init

7-4 ISDN

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Image 119
Telos ZephyrExpress user manual Spids