Abstract: A first near-end terminal is able to conduct voice or video calls with at least one far-end terminal via a packet-based communication system, the first near-end terminal being a mobile user terminal of a near-end user. The first near-end terminal is enabled to discover proximity of at least one second near-end terminal available to provide a resource for use by the near-end user in conjunction with the first near-end terminal when conducting one of said calls, the resource being for use in conducting at least part of the call or in conjunction with the call. The first near-end terminal is also arranged, based on discovering said proximity, to present the near-end user with a message indicating the availability of the second near-end terminal to provide the resource when conducting the call.