NEC SL1100 Issue 6.0Networking Manual 7 - 54. Set the Expire Time.S ECTION 4 SIP TRUNK O VERVIEWThis section is an overview of basic SIP trunk behavior, protocols, supported SIPtrunking methods and options, supported CODEC as well as other supportedfunctions of SIP Trunking.4.1 General InformationThe NEC SL1100 SIP Trunks behave like some SIP User Agents (UA). UA isthe client application used with a particular network protocol.The NEC SL1100 provides a maximum of 32 register IDs and can registerthese IDs with any SIP server.A maximum number of 32 SIP trunks can be used with the NEC SL1100system. The maximum number of simultaneous VoIP calls is determined bythe number of resources available on the VoIPDB.The NEC SL1100 can connect any SIP server over a NAPT router by onestatic global IP address. The NEC SL1100 system supports a DNS resolutionaccess and a IP address direct access for SIP servers and supports the sub-address feature with SIP trunk interconnection.4.2 Supported ProtocolsThe following protocols are supported: SIP (RFC2543 bis04) SIP RFC3261 Supported [updated version of RFC2543] The SIP stack has been updated from RFC2543 Base to RFC3261 Base SDP RTP/RTCP UDP IPv4 T.38 (draft-ietf-sipping-realtimefax-02.txt)
