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

© 2000 Cisco Systems, Inc.

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Cisco Systems 30 VIP Message Description Station Register, Station Reset, Station IP Port, Acknowledge, Request, Response

30 VIP specifications

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