Which statement describes Party Lines in telephony?

Which statement describes Party Lines in telephony?

• A. Party lines always route to the primary line only.
• B. The system can identify which party called 911 on a party line.
• C. This type of service uses a single line for multiple subscribers; the system cannot distinguish which party called 911.
• D. This type of service accesses multiple PSAPs automatically.

Answer: (C)

Party lines involve multiple subscribers sharing a single physical telephone line. Because more than one residence uses that same line, there isn’t a unique caller identity tied to an individual subscriber when 911 is dialed. The call goes to the PSAP based on that shared line, but the system cannot tell which party on the line placed the call without additional information. This is why the statement that uses a single line for multiple subscribers and cannot distinguish which party called 911 is correct. The other descriptions don’t fit how party lines operate: one line isn’t limited to a primary line, the system can’t reliably identify the specific caller on the line, and party lines aren’t about automatically accessing multiple PSAPs.

Party lines involve multiple subscribers sharing a single physical telephone line. Because more than one residence uses that same line, there isn’t a unique caller identity tied to an individual subscriber when 911 is dialed. The call goes to the PSAP based on that shared line, but the system cannot tell which party on the line placed the call without additional information. This is why the statement that uses a single line for multiple subscribers and cannot distinguish which party called 911 is correct. The other descriptions don’t fit how party lines operate: one line isn’t limited to a primary line, the system can’t reliably identify the specific caller on the line, and party lines aren’t about automatically accessing multiple PSAPs.