Cisco SPA962-NA Administration Guide - Page 138
SIP Settings, EXT SIP Port
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Ext 1/2/3/4/5/6 Tab Jitter Buffer Adjustment Chapter 5 SPA900 Series Phone Field Reference Controls how the jitter buffer should be adjusted. Select the appropriate setting: up and down, up only, down only, or disable. The default is up and down. SIP Settings Field SIP Transport SIP Port SIP 100REL Enable EXT SIP Port Auth Resync-Reboot SIP Proxy-Require SIP Remote-Party-ID SIP GUID Description Transport type used for SIP messages. The options are UDP, TCP, or TLS. The default is UDP. Port number of the SIP message listening and transmission port. The default is 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. The default is no. The external SIP port number. If this feature is enabled, the 900 Series phone authenticates the sender when it receives the NOTIFY resync reboot (RFC 2617) message. To use this feature, select yes. Otherwise, select no. The default is yes. The SIP proxy can support a specific extension or behavior when it sees this header from the user agent. If this field is configured and the proxy does not support it, it responds with the message, unsupported. Enter the appropriate header in the field provided. To use the Remote-Party-ID header instead of the From header, select yes. Otherwise, select no. The default is yes. The Global Unique ID is generated for each line for each device. When it is enabled, the 900 Series phone adds a GUID header in the SIP request. The GUID is generated the first time the unit boots up and stays with the unit through rebooting and even factory reset. This feature was requested by Bell Canada (Nortel) to limit the registration of SIP accounts. The default is yes. 5-40 Linksys 900 Series IP Phone Administrator Guide Document Version 3.0