Grandstream Phones

Account Name SIP2SIP
SIP Server sip2sip.info
Outbound Proxy proxy.sipthor.net
SIP User ID Your sip2sip username without the domain part
Authenticate Password Your sip2sip password
Name Your real name displayed on remote devices e.g. John Doe
DNS Mode NAPTR/SRV
Subscribe to MWI Yes
Publish for Presence Yes
Preferred Vocoder Set G722 wideband and PCMA on top
DTMF RFC2833