When adding new POTS users under a IAD, which type of number should be configured in the U1900?

Question

Options

• ASIP
• BPOTS
• CH.248
• DBICC

• A
  84% (21)
• B
  4% (1)
• C
  8% (2)
• D
  4% (1)

Explanation

When POTS users are connected via an IAD (Integrated Access Device), the IAD itself acts as a SIP endpoint - it converts the analog POTS signals into SIP signaling before communicating with the U1900 softswitch. Therefore, SIP-type numbers must be configured in the U1900 to register and identify these subscribers, even though the physical handset is a traditional analog phone.

Why the distractors are wrong:

• B (POTS): POTS describes the analog technology at the subscriber's physical connection - it is not a number type that exists in a softswitch like the U1900.
• C (H.248): H.248/MEGACO is a control protocol used between a Media Gateway Controller and a Media Gateway, not a subscriber number type.
• D (BICC): BICC (Bearer Independent Call Control) is an SS7-based protocol for trunk/carrier interconnection, not for configuring end-user subscriber numbers.

Memory tip: Think of it as "the IAD translates, SIP communicates." No matter what technology the end user has (POTS), by the time signaling reaches the U1900, the IAD has already converted it to SIP - so the U1900 only knows SIP numbers.

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