SIP | SIP signaling, as specified in IETF RFC 3261. |
TLS | The Transport Layer Security (TLS) is a cryptographic protocol that provides secure communication over a network. Voice Gateway supports TLS 1.2 and later versions. TLS 1.3 is preferred for optimal security. |
SIP over TLS | Partially encrypted SIP, as specified in IETF RFC 3261. Some servers may communicate unencrypted, depending on specific requirements. |
SIPS | Fully encrypted SIP, as specified in IETF RFC 3261. All servers in the communication chain use TLS for encrypted communication. |
SIP over WebSockets | SIP over secure WebSockets, as specified in RFC 7118. |
RTP | The Real-time Transport Protocol as specified in RFC 3550. |
SRTP | Encrypted media using the Secure Real-time Transport Protocol (SRTP), as specified in RFC 3711. |
RTCP | The RTP Control Protocol (RTCP) provides quality of service (QoS) statistics for RTP media streams. |
Session Description Protocol (SDP) | The Session Description Protocol (SDP), as specified in RFC 4566. |
Offer/Answer Model with the Session Description Protocol (SDP) | The offer or answer model for negotiating SIP sessions, as specified in RFC 3264. |
DTMF | The use of RTP payloads to carry DMTF events, as specified in RFC 2833. |
SIP Digest Authentication | SIP Digest Authentication challenges and authenticates SIP devices, as specified in RFC 8760. |
SIPREC | Acting as a SIPREC client or server to accomplish call recording, as specified in RFC 7866. |
WebRTC clients | Receiving calls from WebRTC clients, such as web browsers or native mobile apps. |
DTMF - SIP INFO | Receiving DTMF via SIP INFO, as specified in RFC 2976. |
SIP OPTIONS | OPTIONS pings to allow remote SIP gateways and Session Border Controllers (SBCs) to test the health of the Voice Gateway SBCs. |
Session timers | SIP session timers, as specified in RFC 4028. |
SIP UPDATE | The SIP UPDATE method to refresh SIP session. |
STUN | Session Traversal Utilities for NAT (STUN), as specified in RFC 5389. |
Diversion Indication in SIP | The Diversion header, as specified in RFC 5806. |
SIP REFER | Sending the SIP REFER method to transfer calls, as specified in RFC 3515. Receiving SIP REFER is not supported. |