Hi,

----- Original Message -----
> From: [email protected]
> To: [email protected]
> Sent: Monday, December 2, 2013 1:22:55 AM
> Subject: [SFLphone] [Technical] Secure authentication
> 
> asaunie sent a message using the contact form at
> http://sflphone.org/contact.
> 
> Hello, I'm curious to know how sflphone authenticates with the sip
> server.
> Does it use tls for key exchange or is my username and password going
> over
> the wire in plain text?

TLS support is available, but your SIP provider would have to support it, 
see:
http://www.voip-info.org/wiki/view/SIP+TLS

As for how your username and password are normally transmitted, see:
http://www.sipsorcery.com/mainsite/Help/SIPPasswordSecurity
(summary: not in plaintext but fairly vulnerable).

That said, we are very concerned with secure calling and are looking
to implement support for DTLS-SRTP (http://tools.ietf.org/html/rfc6347) in the 
near future.

Best,
Tristan

-- 

Tristan Matthews
Développeur de logiciels libres
[email protected]
Ligne directe: 514-276-5468 poste 190

Fax : 514-276-5465
7275 Saint Urbain
Bureau 200
Montréal, QC, H2R 2Y5

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