VoIP: SIP-over-TLS and sRTP: Voip by Antisip

Antisip is the show-case tool for the closed-source amsip (SDP layer) which uses the open-source eXosip2 (SIP layer).

Last tested version

5.2.1-434
retested in May 2020 with 5.2.1-514

Configuration

SIP-URI Host:	Options → Settings → SIP Account → Domain
SIP-URI User:	Options → Settings → SIP Account → Username
SIP-over-TLS:	Options → Settings → Extra → Protocol: TLS (Verify certificates)
SDES-sRTP:	Options → Settings → Extra → RTP profile: RTP/AVP (+optional SRTP) which is RTP/AVP with crypto

Software Bugs

SHA-2 Digest:

does not pick MD5, continues without header Authorization, therefore is not able to register; therefore incompatible with Linphone

Security

Bugs:

~~SDES-sRTP key with reduced entropy (keys observed were hex: 0-9a-f)~~ fixed in Nov. 2019 with version 5.2.1-449
~~DNS-SRV redirection disables Hostname Validation~~ fixed in Nov. 2019 with version 5.2.1-449

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