What is TCS ,OLC and MSD in H.245

[Pointbreak]

Team,

Can any one brief it in a simple sentence

TCS ,OLC and MSD in H.245!

[Rajan]

TCS terminal capability set - which lists capabilities supported (codecs & dtmf methods). Both endpoints provides the capabilities they support for the call

OLC open logical channel - which asks the endpoint to open a port for media communication

Endpoint responds with a OLC ACK message providing the RTP port number it has opened for communication for that call

MSD is master slave determination between the endpoints

HTH

Rajan

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[Pointbreak]

Rajan thanks for your reply,

In TCS,What is capabilites meant ?

MSD, On what basis this is determined

Codec and Ip address negotation, Are these comes under TCS?

I am new to this. Please consider, though it is quite old 

[Rajan]

Capabilties includes codecs and dtmf methods not IP address

MSD is explained well in the below discussion:

https://supportforums.cisco.com/discussion/12206826/master-slave-determination-cucm

http://tools.ietf.org/html/draft-rfced-info-lantz-00

[Rajan]

Below link shows how the call flow looks like:

http://docwiki.cisco.com/wiki/Cisco_IOS_Voice_Troubleshooting_and_Monitoring_--_H.323-Related_Standards

HTH

Rajan

[Manish Gogna]

Hi Manzoor,

In addition to the nice info provided by Rajan you may check the following doc which shows how to track H225 and H245 messages in a callmanager trace and how these messages look like

https://supportforums.cisco.com/document/44911/tracking-h323-calls-cucm-sdi-traces#Find_the_Negotiated_H.245_Port

Manish

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