• RTP/RTCP• UDP• IPv4• T.38 (draft-ietf-sipping-realtimefax-02.txt)4.3 Supported SIP MethodsThe following SIP methods are supported with the NEC SL2100 system:• REGISTER• INVITE• BYE• CANCEL• ACK• PRACK• Response 1xx 2xx, 3xx, 4xx, 5xx, 6xxThe following features are available:• Support the 401 response for the Initial InviteIf 401 message is sent for the Initial Invite, with previous software, the system cannot respond to themessage correctly.• Support the 401/407 response for the Invite of Session TimerIf 401/407 response is sent for the invite of Session Timer, the system can send the Invite messagewith Authentication header.• Support the 128 byte size of Nonce max value sent by the 401/407 messageThe Nonce maximum size sent by the 401/407 message is expanded to 128 byte. With previoussoftware, 64 byte size can be received.4.4 Supported SIP Trunking OptionsThe options listed below are supported with SIP Trunking.• 100rel• Session Timer• Early Media4.5 Supported CODECSIP Trunking can use the following CODECs.• G.729. Low bandwidth requirement, and is used on most Wide Area Network links.- VAD- VIF size 20ms~30ms• G.711 – High bandwidth requirement – usually used on Local Area Networks.• G.722 – This CODEC is useful in fixed network, Voice over IP applications, where the requiredbandwidth is typically not prohibitive.• G.726 – is an ITU-T ADPCM speech coded standard covering the transmission of voice at rates of16, 24, 32, and 40Kbps.SECTION 5 SUPPORTED SIP TRUNKING FUNCTIONSThe functions in this section are supported by NEC SL2100 SIP Trunking.SL2100 ISSUE 1.07-4 SIP Trunking
