T2 Timer ....................................................................................................................78Timer B .....................................................................................................................78Timer D .....................................................................................................................79Timer F ......................................................................................................................79Timer H .....................................................................................................................79Timer J ......................................................................................................................794.6.2.10 Quality of Service (QoS) ..............................................................................................79SIP Packet QoS (DSCP) ...........................................................................................794.6.2.11 SIP extensions .............................................................................................................80Supports 100rel (RFC 3262) .....................................................................................80Supports Session Timer (RFC 4028) ........................................................................804.6.2.12 NAT Identity .................................................................................................................80Keep Alive Interval ....................................................................................................80Supports Rport (RFC 3581) ......................................................................................814.6.2.13 Security ........................................................................................................................81Enable SSAF (SIP Source Address Filter) ................................................................814.6.3 VoIP Settings ..................................................................................................................824.6.3.1 RTP Settings ...............................................................................................................82RTP Packet Time ......................................................................................................82Minimum RTP Port Number ......................................................................................82Maximum RTP Port Number .....................................................................................83Telephone-event Payload Type ................................................................................834.6.4 VoIP Settings [Line 1]–[Line 6] .......................................................................................844.6.4.1 Quality of Service (QoS) ..............................................................................................84RTP Packet QoS (DSCP) .........................................................................................844.6.4.2 Statistical Information ..................................................................................................84RTCP Enable ............................................................................................................84RTCP Interval ...........................................................................................................854.6.4.3 Jitter Buffer ..................................................................................................................85Maximum Delay ........................................................................................................85Minimum Delay .........................................................................................................85Initial Delay ...............................................................................................................854.6.4.4 DTMF ...........................................................................................................................86DTMF Type ...............................................................................................................864.6.4.5 Call Hold ......................................................................................................................86Supports RFC 2543 (c=0.0.0.0) ................................................................................864.6.4.6 CODEC Preferences ...................................................................................................87G722 (Enable) ...........................................................................................................87G722 (Priority) ...........................................................................................................87PCMA (Enable) .........................................................................................................87PCMA (Priority) .........................................................................................................87G729A (Enable) ........................................................................................................87G729A (Priority) ........................................................................................................88PCMU (Enable) .........................................................................................................88PCMU (Priority) .........................................................................................................884.7 Telephone ........................................................................................................................884.7.1 Call Control .....................................................................................................................894.7.1.1 Call Control ..................................................................................................................89Send SUBSCRIBE to Voice Mail Server ...................................................................89Inter-digit Timeout .....................................................................................................89Timer for Dial Plan ....................................................................................................90International Call Prefix .............................................................................................90Country Calling Code ................................................................................................90National Access Code ...............................................................................................90Default Line for Outgoing ..........................................................................................906 Administrator Guide Document Version 2011-11Table of Contents