Multinational PR firms often boast of their global network of offices, telling clients that representation in another country is just a matter of picking up the phone, or sending an e-mail.

Getting fast help on a project in Zurich, for example, is no problem: A colleague is readily available to work local connections and offer special insight on his or her market.

The reality, however, is not always so neat and tidy, agency executives concede off the record. That colleague in Zurich ...