Tieline ViA User Manual page 116

116 ViA User Manual v2.0
9. Tap to select each SPID, DN or MSN. If you are in the US enter DN and SPID numbers as
required, or in other regions enter DN or MSN numbers as required. Note: SPID1 and SPID2
are only visible when a ViA (U) USA ISDN module is installed in the codec.
10. Use the on-screen keyboard to enter each number, then tap Done in the top right-hand
corner of the TOUCH SCREEN to add each number.
T
11. ap Save in the top right-hand corner of the TOUCH SCREEN to confirm and store all
entered numbers.
Important Notes:
Directory Numbers and Multiple Subscriber Numbers
Directory Numbers (DN) in North America and Multiple Subscriber Numbers (MSN) in the
rest of the world are simply phone numbers associated with an ISDN B channel, like lines
listed in a typical phone directory. Your Telco will normally supply 2 DN/MSN numbers for
each pair of B channels. However, these numbers may or may not be associated with a
specific B channel.
Often broadcasters prefer to predict which B channel will answer an incoming call to
ensure audio routing is consistent. However, if a DN or MSN number is not entered in the
codec and multiple B channels are available, the codec may use any channel to answer
an incoming call. To ensure calls are routed consistently, enter a DN/MSN number
(without the country or area code) as the DN/MSN for a B channel, then only that
corresponding B channel will answer an incoming call to that number. Programming
DN/MSN numbers for each B channel allows the codec to ignore calls without matching
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