A method of controlling costs associated with a Voice Over IP connection by including in a call connection set-up message sent over an IP network a maximum charge parameter and, when the connection is required to break out of the IP network into a telecommunication network, comparing the maximum charge parameter contained in the set-up message with a charge parameter associated with the break out part of the connection, and making a decision on completing the break out part of the connection based on the result of the comparison.
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