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V100 Versatile Multiplexer Technical Manual Version 2.2
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“01” to “08”, with values assigned in sequential order beginning with “01”. Terminals not sharing the
same main number always use the value “01” by default.
Although the generic SPID format allows for many different combinations of Sharing TID and TID,
configurations that use values other than “0101” may not be available from all ISDN service providers.
Local Directory Number (LDN): Used for call routing, the LDN is associated with a SPID and therefore
with North American BRI interfaces. It is necessary for receiving incoming calls on the second B-channel.
SPID ALLOCATION
SPID Allocation may be performed manually by the user, who simply appends the relevant codes (if
known) to the 10 digit local telephone number. Alternatively, if his ISDN service supports it, the V100
offers an Automatic SPID mode in which only one SPID is supported. The SPID 1 and LDN 1 fields cannot
be entered and if a SPID response is received from the network in response to the first call, the fields are
automatically updated on the menu. A third option – “Auto + SPID guessing” requires the user to enter
the LDN field only. This enables the switch to guess against a likely or similar SPID to reduce the response
time. This mode is recommended.
ANSWER DELAY
The Answer Delay is the delay in milliseconds between the V100 being presented with an ISDN call, and it
indicating to the network that it can answer that call. It may be required when the V100 ISDN port is
attached to equipment that is sensitive to the immediate answering of presented calls.
Some examples of the used of the SPIDs, LDNs and Allocation are given below:
