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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 7: ISDN BASICS 136

Youmusthavethisnumber,anditmustbe100%correct,orthesystemwon’twork.Don’tlet

theinstallerdepartwithoutleavingthem.You’vebeenwarned!

h

HOT TIP!

Most phone companies in the USA have settled on a standardized SPID format, based on the

telephone number. This format is area code+7 digit phone number + 0101. For example, if

your phone number was (321) 555-1234 then your SPID would be 32155512340101.

For a list of known working SPID formats, listed by telephone company, see Appendix 4

(Known Working SPIDs by Telephone Company).

i

ISDN TIP!

In an emergency, to save a remote, you might be able to get a line to work without the proper

SPIDs by dialing into it. If it works, this fix is only temporary, and the line will fail to

initialize next time the Zephyr Xstream is booted.

i

ISDN TIP!

If you see SPID ERROR as your line status, your SPID for that channel is incorrect. In this

case check the SPID. For a list of known working SPID formats listed by telephone company

see Appendix 4 (Known Working SPIDs by Telephone Company).

Directory Numbers (DNs) and Multiple Subscriber Numbers (MSNs)

DirectoryNumbers

DirectoryNumbers,orDNsforshort,arethe7digittelephonenumbersassignedtotheISDN

lines(aswouldtypicallyfoundinthetelephonedirec tory)intheUSA&Canada.Youmaybe

assignedoneortwo,dependinguponthelineconfiguration.Inthecasewhereyouhavetwo

activeIS

DNBchannels,youwillusuallyhavetwoDNs(butnotalways).However,the"physical"

channels(i.e.“timeslots”)areindependentfromthe"logical"numbers.Acallcominginonthe

secondnumberwillbeassignedthefirstphysicalBchannel,ifitisnotalreadyoccupied.

Therefore,theremu

stbesomewayfortheZephyrXstreamtosortoutwhichcallgoestowhich

channel/line.TheDNisusedforthisfunctionwhentheUSAISDNprotocolsareused.

Whenacallringsin,itcontainsset‐upinformation,whichincludestheDNthatwasdialedbythe

originatingca

ller.Thelast4digitsarematchedwiththeDNsprogrammedintotheZephyr

Xstream,andtheproperassignmentismade.Therefore,problemswithDirectoryNumberswill

virtuallyalwaysbedifficultiesrelatedtoreceivingcalls.



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