4.5.2.9 Timer Settings ...........................................................................................................111T1 Timer ..................................................................................................................111T2 Timer ..................................................................................................................111Timer B ...................................................................................................................112Timer D ...................................................................................................................112Timer F ....................................................................................................................112Timer H ...................................................................................................................112Timer J ....................................................................................................................1134.5.2.10 Quality of Service (QoS) ............................................................................................113SIP Packet QoS (DSCP) .........................................................................................1134.5.2.11 SIP extensions ...........................................................................................................113Supports 100rel (RFC 3262) ...................................................................................113Supports Session Timer (RFC 4028) ......................................................................1134.5.2.12 NAT Identity ...............................................................................................................114Keep Alive Interval ..................................................................................................114Supports Rport (RFC 3581) ....................................................................................1144.5.2.13 Security ......................................................................................................................114Enable SSAF (SIP Source Address Filter) .............................................................1144.5.3 VoIP Settings ................................................................................................................1154.5.3.1 RTP Settings .............................................................................................................115RTP Packet Time ....................................................................................................115Minimum RTP Port Number ....................................................................................115Maximum RTP Port Number ...................................................................................116Telephone-event Payload Type ..............................................................................1164.5.4 VoIP Settings [Line 1]–[Line x] .....................................................................................1174.5.4.1 Quality of Service (QoS) ............................................................................................117RTP Packet QoS (DSCP) .......................................................................................117RTCP Packet QoS (DSCP) .....................................................................................1174.5.4.2 Statistical Information ................................................................................................118RTCP Enable ..........................................................................................................118RTCP Interval .........................................................................................................1184.5.4.3 Jitter Buffer ................................................................................................................118Maximum Delay ......................................................................................................118Minimum Delay .......................................................................................................118Initial Delay .............................................................................................................1194.5.4.4 DTMF .........................................................................................................................119DTMF Type .............................................................................................................119DTMF Relay ............................................................................................................1194.5.4.5 Call Hold ....................................................................................................................120Supports RFC 2543 (c=0.0.0.0) ..............................................................................1204.5.4.6 CODEC Preferences .................................................................................................120G722 (Enable) .........................................................................................................120G722 (Priority) .........................................................................................................120PCMA (Enable) .......................................................................................................121PCMA (Priority) .......................................................................................................121G726–32 (Enable) ..................................................................................................121G726–32 (Priority) ...................................................................................................121G729A (Enable) ......................................................................................................121G729A (Priority) ......................................................................................................122PCMU (Enable) .......................................................................................................122PCMU (Priority) .......................................................................................................1224.6 Telephone ......................................................................................................................1224.6.1 Call Control ...................................................................................................................1234.6.1.1 Call Control ................................................................................................................123Send SUBSCRIBE to Voice Mail Server ................................................................123Document Version 2013-03 Administrator Guide 7Table of Contents