Cisco Systems 30 VIP Message Description Station Register, Station Reset, Station IP Port, Date

Cisco IP Telephony Troubleshooting Guide for Cisco CallManager Release 3.0(1)

The primary messages in the Skinny Station registration process are described in the following table.

Skinny Station Registration Process Descriptions

Message	Description
Station Register	The station sends this message to announce its existence to the
	controlling Cisco CallManager.
Station Reset	Cisco CallManager sends this message to command the station to reset
	its processes.
Station IP Port	The station sends this message to provide Cisco CallManager with the
	UDP port to be used with the RTP stream.
Station Register	Cisco CallManager sends this message to acknowledge the registration
Acknowledge	of a station.
Station Register Reject	Cisco CallManager sends this message to reject a registration attempt
	from the indicated phone.
	char text[StationMaxDisplayTextSize];
	};
	Where:
	text is a character string, maximum length of 33 bytes, containing a
	textual description of the reason that registration is rejected.
Station Capabilities	Cisco CallManager sends this message to request the current
Request	capabilities of the station. Station capabilities may include compression
	standard and other H.323 capabilities.
Station Version Request	The station sends this message to request the version number of the
	software load for the station.
Station Version Response	Cisco CallManager sends this message to inform the station of the
	appropriate software version number.
Station Capabilities	The station sends this message to Cisco CallManager in response to a
Response	Station Capabilities Request. The station’s capabilities are cached in
	the Cisco CallManager and used to negotiate terminal capabilities with
	an H.323 compliant Terminal.
Station Button Template	The station sends this message to request the button template
Request	definition for that specific terminal or Cisco IP Phone.
Station Button Template	Cisco CallManager sends this message to update the button template
Response	information contained in the station.
Station Time Date Request	The station sends this message to request the current date and time for
	internal usage and for displaying as a text string.
Station Define Time and	Cisco CallManager uses this message to provide the date and time
Date	information to the station. It provides time synchronization for the
	stations.

Cisco IP Phone-to-Cisco IP Phone Call Flow within a Cluster

This section describes a Cisco IP Phone (directory number 1000) calling another Cisco IP Phone (directory number 1001) within the same cluster. The cluster is a group of Cisco CallManagers having one common Publisher SQL database and many Subscriber SQL databases.

In our sample topology, CCM1 is the publisher and CCM2 is a subscriber. The two

Cisco IP Phones (1000 and 1001) are registered to CCM1 and CCM2, respectively. The call flow is shown in the diagram below. The two Cisco CallManagers within a cluster communicate with each other using Intra-Cluster Control Protocol(ICCP). When a Cisco IP Phone goes off-hook , it opens a control Skinny Station session (with TCP as the underlying protocol) with the

Cisco CallManager. After call control signaling is established between the two Cisco IP Phones

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