The meeting webpage says the meeting begins at 19h00 (top right): http://www.europarl.europa.eu/meetdocs/2004_2009/organes/imco/imco_20080707_...
Information about the most important people to contact can be found here: http://www.laquadrature.net/wiki/Mobilisation_Paquet-Telecom#English
Phone calls are better than emails, but emails are still good.
For phone calls, you have to do some research first so that you know how to answer their questions about why you oppose this.
If the phone is (as usual) answered by the assistant, they might tell you the MEP has no time or isn't in the office. To still have a chance of getting a message across, it's good to start the call with "Hi, I'm calling XXX to ask them to reject the telecoms package amendents regarding Intellectual Property".
MEPs listen to people from their country, so please check the above link (on laquadrature.net) to see if an MEP from your country is on the high priorty to-contact list.