Subscriber mobility in telephony systems

A telecommunications system for routing a contact to a selected address, comprising:

• (a) an input for receiving a contact message comprising a source address and a destination address associated with a subscriber;
• and
• (b) mobility agent means for determining whether or not the source address of the contact message corresponds to a proxy server and, when the contact source corresponds to a proxy server, causing the contact referenced in the contact message not to be routed to a selected address and, when the contact source does not correspond to a proxy server, causing the contact referenced in the contact message to be routed to the selected address.

A telecommunications system for routing a contact to a selected address, comprising:

• (a) an input for receiving a contact message comprising a source address and a destination address associated with a subscriber;
• and
• (b) a mobility agent for determining whether or not the source address in the contact message corresponds to a proxy server and, when the source address corresponds to a proxy server, causing the contact not to be routed to a selected address and, when the source address does not correspond to a proxy server, causing the contact to be routed to the selected address.