Apparatus and method for optimizing message sizes of textual protocols used in multimedia communications

A method of generating a compressed message from a full message in a mobile station that has registered with a network via a Register message, the method comprising the steps of:

• generating a full message;
• building static and default dictionaries containing information from the Register message;
• and
• deleting information in the full message that matches the information in the static and default dictionaries to generate the compressed message.

A method of generating a full message from a compressed message comprising the steps of:

• receiving a compressed message;
• retrieving a URL in a field of the message;
• obtaining information corresponding to the URL from a database;
• building static and default dictionaries from the information;
• adding information from the static dictionary to the information in the compressed message to produce an interim full message;
• and
• adding information from the default dictionary to the interim full message to produce the full message.

A method of generating a full message from a compressed message in a mobile station that has registered with a network, the method comprising the steps of:

• receiving a compressed message;
• retrieving registration information from a static dictionary and a default dictionary;
• adding information from the static dictionary to the information in the compressed message to produce an interim full message;
• and
• adding information from the default dictionary to the interim full message to produce the full message.