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Linksys SPA9x2 Phone Administration Guide 51
RTP Parameters
Setting SIP Parameters
Response Status Notes
• SIT1 RSC: SIP response status code for the appropriate Special Information Tone (SIT). For
example, if you set the SIT1 RSC to 404, when the user makes a call and a failure code of
404 is returned, the SIT1 tone is played. Reorder or Busy Tone is played by default for all
unsuccessful response status code for SIT 1 RSC through SIT 4 RSC.
Defaults to blank.
• Try Backup RSC: SIP response code that retries a backup server for the current request.
Defaults to blank.
• Retry Reg RSC : Interval the SPA9x2 waits before re-trying registration after a failed
registration. Defaults to blank.
RTP Parameters
RTP Notes
• Max RTP ICMP Err: Number of successive ICMP errors allowed when transmitting RTP
packets to the peer before the SPA9x2 terminates the call. If the value is set to 0 (the
default), the SPA9x2 ignores the limit on ICMP errors, disabling the feature.
• RTCP Tx Interval: Interval for sending out RTCP sender reports on an active connection.
During an active connection, the SPA9x2 can be programmed to send out compound
RTCP packet on the connection.
Each compound RTP packet except the last one contains a sender report (SR) and a
source description (SDES). The last RTCP packet contains an additional BYE packet. Each
SR except the last one contains exactly 1 reciever report (RR); the last SR carries no RR.
The SDES contains CNAME, NAME, and TOOL identifiers. :
–CNAME is set to User ID@Proxy
– NAME is set to Display Name (or Anonymous if user blocks caller ID)
– TOOL is set to the Vendor/Hardware-platform-software-version (such as Linksys/
SPA9x2-5.2.2(SCb)).
– The NTP timestamp used in the SR is a snapshot of the SPA9x2’s local time, not the
time reported by an NTP server.
– If the SPA9x2 receives a RR from the peer, it tries to compute the round trip delay
and show it as the Call Round Trip Delay value in the Info section of SPA9x2 web
page. It can range from 0 to 255 seconds. Defaults to 0 (recommended).