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RTP Protocol Parameters
Parameter Description Default
Base RTP port (1024-65535)
The minimum IP port number for RTP
traffic. Can be used in conjunction with
firewall mappings.
1234
Maximum RTP port (1024-65535)
The maximum IP port number for RTP
traffic.
1253
RTP Public External IP Address
Forces a specific external IP address as
the source address for SDP messages
that the VoIP Subsystem sends.
0.0.0.0
RTP Public External Port
Specifies the RTP port associated with
the minimum RTP port number in a NAT
firewall that performs fixed port mapping.
0 (Disabled)
RTP TOS Value (0x00-0xff)
Type of service (TOS) value or DIFFServ
DSCP used for RTP (audio) packets.
68 (Assured
Forwarding)
RTP Packet Duration (ms)
The duration (in milliseconds) for frame-
based codecs
30
RTP Stream Duration (ms)
The duration (in milliseconds) for sample
stream-based codecs
20
RTP Session Timeout Interval (s)
The session timeout interval (in seconds) 120
RTP Jitter Buffer Start Depth (ms)
The start depth (in milliseconds) of the
buffer
20
RTP Jitter Buffer Minimum Depth (ms)
The minimum depth (in milliseconds) of
the buffer
20
SDP Protocol Parameters
Parameter Description Default
SDP Session Name
Identifies the session name. -
SDP Session Owner
Identifies the session owner. Zoom
SDP Audio Codec Names
These parameters are passed to the remote end-point for outgoing calls only.
Parameter Description Default
G711u Codec (PCMU/8000)
The string passed during outgoing calls to
negotiate the payload type for G.711
μLaw
PCMU/8000
G711A Codec (PCMA/8000)
The string passed during outgoing calls to
negotiate the payload type for G.711
ALaw
PCMA/8000
G729b Codec (G729B/8000)
The string passed during outgoing calls to
negotiate the payload type for G.729B
G729B/8000
iLBC/Codec (iLBC/8000)
The string passed during outgoing calls to
negotiate the payload type for iLBC
iLBC/8000
20 X6v VoIP Features Technical Reference