V6100 and V7122 User Guide 7Using BootP 239Upgrading the V7122 239Vendor Specific Information Field 239Reader’s Notes 240C HAPTER 8: T ELEPHONY C APABILITIES 241Working with Supplementary Services 241Call Hold and Retrieve Features 241Call Transfer 242Configuring the DTMF Transport Types 242Fax & Modem Transport Modes 244Fax/Modem Settings 244ThroughPacket™ 246Dynamic Jitter Buffer Operation 246Configuring the Gateway’s Alternative Routing (based on Connectivity and QoS) 248Alternative Routing Mechanism 248Determining the Availability of Destination IP Addresses 248PSTN Fallback as a Special Case of Alternative Routing 249Relevant Parameters 249Call Detail Report 249Supported RADIUS Attributes 251RADIUS Server Messages 253Trunk to Trunk Routing Example 253Proxy or Registrar Registration Example 254SIP Call Flow Example 255SIP Authentication Example 258Reader’s Notes 262C HAPTER 9: N ETWORKING C APABILITIES 263Ethernet Interface Configuration 263Ethernet Interface Redundancy 264NAT (Network Address Translation) Support 264STUN 265First Incoming Packet Mechanism 266RTP NO-OP 267Point-to-Point Protocol over Ethernet (PPPoE) 267Point-to-Point Protocol (PPP) Overview 267
