SIPS and STRP support

[svaza]

Hi,

Does SIP Sorcery support SIPS and SRTP ?

Thanks

[sipsorcery]

SIPS yes. SRTP no.

SRTP is used in WebRTC connections but nobody has ever gotten around to it for SIP/VoIP. All the primitives are there if you feel like having a crack.

[svaza]

Thanks for replying, What are the other protocols supported by SipSorcery to ensure secured packet transfer between SIP trunk and client ?

[sipsorcery]

There are no media encryption options for SIP in this library.

For WebRTC connections media is encrypted using SRTP where the key gets negotiated over DTLS.

[svaza]

Can you give a headstart for supporting SRTP in SipSorcery ?

[sipsorcery]

If you look in the DtlsSrtp you'll see the classes related to SRTP. The high level steps would be something like:

• Extract the SRTP logic from the classes mentioned to separate them from the DTLS handshake,
• Determine which SIP key exchange mechanism you want to support,
• Initialise the SRTP key from the new key exchange mechanism.