Technical Capabilities

We provide detailed overview of the platform’s extensive technical capabilities, including support for various protocols such as SIP and RTP, as well as audio codecs.

Protocols

Protocol	Description
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.
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.
DTMF	The use of RTP payloads to carry DMTF events, as specified in RFC 2833.
SIP REFER	Sending the SIP REFER method to transfer calls, as specified in RFC 3515. Receiving SIP REFER is not supported.

Codecs

• G.722 native.

• G.711

• G.729

• OPUS (only SBC).

Capabilities

Trunk management and Routing

• Transferring calls via SIP REFER or SIP INVITE.

• Multiple SIP trunks per customer.

• Configuring SIP trunks with options like tech prefix, SIP Diversion header, Outbound authentication (including REGISTER).

• Routing calls based on a trunk group, Direct Inward Dialing (DID), or DID range.

• Least-cost routing selection of outbound trunk.

Features

• Custom SIP headers on inbound and outbound calls.

• Mid-call SIP INFO requests.

• P-Asserted-Identity header to identify caller.

• Receiving compact SIP headers.

• Receiving re-INVITE with no Session Description Protocol (SDP).

• Configurable music on hold.