26 V6100 and V7122 User Guide Supports various number manipulation rules for IPÆTel and TelÆIP, called and callingnumbers. Option to configure ISDN Transfer Capability per trunk. Supports QSIG messages tunneling over SIP according to tunnel-03>. Supports ISDN PRI Setup and Facility messages tunneling over SIP INVITE and INFOmessages.Supported SIP Features Reliable User Datagram Protocol (UDP) transport, with retransmissions. Transmission Control Protocol (TCP) Transport layer. SIPS using TLS. T.38 real time fax (using SIP).If the remote side includes the fax maximum rate parameter in the SDP body ofthe INVITE message, the gateway returns the same rate in the response SDP. Works with Proxy or without Proxy, using an internal routing table. Fallback to internal routing table if Proxy is not responding. Supports up to four Proxy servers. If the primary Proxy fails, the V7122 automaticallyswitches to a redundant Proxy. Supports domain name resolving using DNS SRV records for Proxy, Registrar anddomain names that appear in the Contact and Record-Route headers. Proxy and Registrar Authentication (handling 401 and 407 responses) using Basic orDigest methods. Accepted challenges are kept for future requests to reduce the networktraffic. Single gateway Registration or multiple Registration of all gateway endpoints. Supported methods: INVITE, CANCEL, BYE, ACK, REGISTER, OPTIONS, INFO,REFER, UPDATE, NOTIFY, PRACK and SUBSCRIBE. Modifying connection parameters for an already established call (re-INVITE). Working with a Redirect server and handling 3xx responses. Early Media (supporting 183 Session Progress). PRACK reliable provisional responses (RFC 3262). Call Hold and Transfer Supplementary services using REFER, Refer-To, Referred-By,Replaces and NOTIFY messages.
