Special facilities of the IP provider. internationalNumber: Generate international phone number. CLIR: 1 -> Deactivate number suppression. UseUserID: Use UserID as phone number. notRegistered: Not registered with VoIP provider. logInProxy: Allow login of a proxy. compression: voice compression useAreaCode: add area code to dialed number noHoldRetrieve: no hold/retrieve message to the provider replaceIntPrefix: replace intern. prefix (e.g. '00) with '+' clrProvBind: clear provider binding natPing: If set to 0 no NAT ping packets will be send. Set to 1 periodic NAT ping packets will be send. g726coding: 0 -> I.366 1 -> RFC 3551/X.420 earlyConnect: allow early SIP connect srtp: allow SRTP negotiation noT38: 1 -> FAX via T.38 disabled callDeflection: redirect an unanswered call to another endpoint during the call setup phase (code 302) sendUpdate: send SIP UPDATE sendUserAccinPpreferred:Always send user account in P-Preferred-identity header field sendUserAccinPasserted: Always send user account in P-Asserted-identity header field