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+# Catphone
+
+A VoIP softphone operated by a cat.
+
+## Roadmap
+
+- [ ] SIP
+	- [x] REGISTER
+		- [x] MD5
+		- [ ] SHA-2
+	- [ ] INVITE
+- [ ] SDP
+- [ ] RTP/RTCP
+- [ ] Codecs
+	- [ ] G.711
+		- [ ] PCMU (µ-law)
+		- [ ] PCMA (a-law)
+
+## References
+
+- rfc3261 - SIP: Session Initiation Protocol
+- rfc8760 - The Session Initiation Protocol (SIP) Digest Access Authentication Scheme
+- rfc5626 - Managing Client-Initiated Connections in the Session Initiation Protocol (SIP)
+- rfc8866 - SDP: Session Description Protocol
+- rfc3264 - An Offer/Answer Model with the Session Description Protocol (SDP)