In-band signaling

From Hill2dot0

In-band signaling, also known as channel associated signaling (CAS), refers to the practice of carrying signaling information in the same channel, or band, that is used to carry user information. This occurs only in networks that provide switched services (either packet or circuit). Examples of in-band signaling include signaling on a POTS service, robbed-bit signaling on a T-1, and SIP signaling in an IP network.

In-band signaling is typically simpler to implement because it uses the same network infrastructure used by user traffic. However, it also makes some (or all) of the signaling network available to the user, which makes fraud and error more likely. It also consumes some of the bandwidth, reducing the amount of bandwidth available to the user.

See Also

• Non facilities associated signaling (NFAS)
• Out-of-band signaling
• Robbed-bit signaling

PodSnacks

| In-band vs. out-of-band signaling