Figure 6-16: Voice - Sip Screen - Response Status Code Handling; Figure 6-17: Voice - Sip Screen - Rtp Parameters; Figure 6-18: Voice - Sip Screen - Sdp Payload Types - Linksys SPA9000 User Manual

IP Telephony System
Reg Retry Long Intvl. When registration fails with a SIP response code that does not match, the System will wait
for the specified length of time before retrying. If this interval is 0, then the System will stop trying. This value
should be much larger than the Reg Retry Intvl value. The default is 1200.
Response Status Code Handling
SIT1-4 RSC. Enter the SIP response status code for the appropriate SIT Tone (SIT stands for Special Information
Tone). For example, if you set the SIT1 RSC to 404, then when the user makes a call and a failure code of 404 is
Figure 6-16: Voice - SIP Screen - Response Status Code
returned, the SIT1 tone is played.
Handling
Try Backup RSC. This is the SIP response code that retries a backup server for the current request.
Retry Reg RSC. This is the interval to wait before the System retries registration after failing during the last
registration.
RTP Parameters
RTP Port Min. This is the minimum port number for RTP transmission and reception. The default is 16384.
RTP Port Max. This is the maximum port number for RTP transmission and reception. The default is 16482.

Figure 6-17: Voice - SIP Screen - RTP Parameters

RTP Packet Size. This is the packet size in seconds, which can range from 0.01 to 0.16. Valid values must be a
multiple of 0.01 seconds. The default is 0.030.
Max RTP ICMP Err. This indicates that the RTP data stream has failed due to ICMP errors. The default is 0.
RTCP Tx Interval. This is the interval for sending out RTCP sender reports on an active connection. It can range
from 0 to 255 seconds. The default is 0.
No UDP Checksum. Select yes if you want the System to calculate UDP header checksum for SIP messages.
Otherwise, select no. The default is no.
Stats in BYE. This sets whether the System will include the P-RTP-Stat header or response to a BYE message.
The header contains RTP statistics of the current call. Select yes or no from the drop-down menu. The default
is no.
SDP Payload Types
NSE Dynamic Payload. This is the NSE dynamic payload type. The default is 100.
AVT Dynamic Payload. This is the AVT dynamic payload type. The default is 101.

Figure 6-18: Voice - SIP Screen - SDP Payload Types

Chapter 6: Using the Web-based Utility 37
The Voice Tab
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