DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
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AVT Codec Name AVT Codec name used in SDP Str31 telephone-event
G711a Codec Name G711a Codec name used in SDP Str31 PCMA
G711u Codec Name G711u Codec name used in SDP Str31 PCMU
G726r16 Codec Name G726-16 Codec name used in SDP Str31 G726-16
G726r24 Codec Name G726-24 Codec name used in SDP Str31 G726-24
G726r32 Codec Name G726-32 Codec name used in SDP Str31 G726-32
G726r40 Codec Name G726-40 Codec name used in SDP Str31 G726-40
G729a Codec Name G729a Codec name used in SDP Str31 G729a
G729b Codec Name G729b Codec name used in SDP Str31 G729ab
G723 Codec Name G723 Codec name used in SDP Str31 G723
Notes:
1. SPA uses the configured codec names in its outbound SDP
2. SPA ignores the codec names in incoming SDP for standard payload types (0 – 95).
3. For dynamic payload types, SPA identifies the codec by the configured codec names. Comparison is
case-insensitive.
NAT Support Parameters
Parameter Name Description Type Default
Handle VIA received If set to “yes”, the SPA will process the “received”
parameter in the VIA header inserted by the server in a
response to any one of its request. Else the parameter is
ignored.
Bool No
Handle VIA rport If set to “yes”, the SPA will process the “rport” parameter
in the VIA header inserted by the UAS in a response. Else
the parameter is ignored.
Bool No
Insert VIA received If set to “yes”, the SPA will insert received parameter in
VIA header in SIP responses if received from IP and VIA
sent-by IP differ
Bool No
Insert VIA rport If set to “yes”, the SPA will insert rport parameter in VIA
header in SIP responses if received-from port and VIA
sent-by port differ
Bool No
Substitute VIA addr If set to “yes”, the SPA will use nat-mapped IP:port values
in VIA header
Bool No
Send Resp To Src Port If set to “yes”, SPA will send a response to the source
port where the corresponding request is received from.
Else the SPA will send the response as indicated in the
VIA header by the UAC
Bool No
STUN Server STUN server to contact for NAT mapping discovery FQDN
STUN Enable Enable the use of STUN to discover NAT mapping Bool No
STUN Test Enable If enabled with <STUN Enable> = “yes” and a valid
<STUN Server>, the SPA will perform a NAT type
discovery operation when first power on by contacting the
configured STUN server. The result of the discovery will
be reported in a Warning header in all subsequent
REGISTER requests –
Bool No
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