Which of the following signaling protocols are categorized as Common Channel Signaling (CCS)? (Multiple Choice)

Question

Options

• ASS7
• BPRA
• CR2
• DSIP

• A
  84% (32)
• C
  11% (4)
• D
  5% (2)

Explanation

SS7 and PRA (ISDN Primary Rate Access) are both CCS protocols because they dedicate a separate, shared signaling channel to control multiple bearer/voice channels - SS7 uses out-of-band signaling links through Signal Transfer Points, while PRA's D-channel carries call control signaling on behalf of all its B-channels. R2 is incorrect because it is a Channel Associated Signaling (CAS) protocol, where signaling is tied per-trunk using in-band MF tones and line bits - exactly the opposite of CCS. SIP is incorrect because while it does separate signaling from media (RTP), it is an application-layer VoIP protocol operating over packet networks and is not categorized within the traditional CCS/CAS taxonomy used in circuit-switched telephony.

Memory tip: Think of CCS as a "manager channel" - one signaling channel manages many voice channels (SS7's links manage entire networks; ISDN's D-channel manages all its B-channels). If signaling is per-channel (R2) or belongs to a completely different protocol world (SIP), it's not traditional CCS.

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