Linksys SPA921 Cisco Small Business IP Phone SPA9X1 Administration Guide - Page 143
SIP Settings, Select from UDP, TCP, or TLS.
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Ext Tab Chapter 5 Linksys IP Phone Field Reference Field SIP TOS/DiffServ Value SIP CoS Value RTP TOS/DiffServ Value RTP CoS Value Network Jitter Level Jitter Buffer Adjustment Description TOS/DiffServ field value in UDP IP packets carrying a SIP message. Defaults to 0x68. CoS value for SIP messages. Defaults to 3. ToS/DiffServ field value in UDP IP packets carrying RTP data. Defaults to 0xb8. CoS value for RTP data. Defaults to 6. Determines how jitter buffer size is adjusted by the Linksys IP phone. Jitter buffer size is adjusted dynamically. The minimum jitter buffer size is 30 milliseconds or (10 milliseconds + current RTP frame size), whichever is larger, for all jitter level settings. However, the starting jitter buffer size value is larger for higher jitter levels. This setting controls the rate at which the jitter buffer size is adjusted to reach the minimum. Select the appropriate setting: low, medium, high, very high, or extremely high. Defaults to high. Controls how the jitter buffer should be adjusted. Select the appropriate setting: up and down, up only, down only, or disable. Defaults to up and down. SIP Settings Note Some of the parameters in this section do not apply to the WIP310 wireless phone. Only the SIP Port and SIP Debug Option parameters apply to the SPA901. Field SIP Transport SIP Port SIP 100REL Enable EXT SIP Port Description Select from UDP, TCP, or TLS. Defaults to UDP. Port number of the SIP message listening and transmission port. Defaults to 5060. To enable the support of 100REL SIP extension for reliable transmission of provisional responses (18x) and use of PRACK requests, select yes. Otherwise, select no. Defaults to no. The external SIP port number. 5-38 Linksys IP Phone Administrator Guide Firmware Version 5.1