A signaling protocol is a type of communications protocol for encapsulating the signaling between communication endpoints and switching systems to establish or terminate a connection and to identify the state of connection.

The following is a list of signaling protocols:

• ALOHA
• Digital Subscriber System No. 1 (EDSS1)
• Dual-tone multi-frequency signaling
• H.248
• H.323
• H.225.0
• Jingle
• Media Gateway Control Protocol (MGCP)
• Megaco
• Regional System R1
• NBAP (Node B Application Part)
• Signalling System R2
• Session Initiation Protocol
• Signaling System No. 5
• Signaling System No. 6
• Signaling System No. 7
• Skinny Client Control Protocol (SCCP, Skinny)
• Q.931
• QSIG