A method of providing services to a plurality of subscribers in a telecommunications network, the subscribers each having subscriber equipment, a main dialling number and a local exchange (318, 406, 506), with which each of said main dialling numbers is associated, the services being of different types including a first service type and a second service type, each of the services of the first service type being supported by said local exchange and each of the services of the second service type not being supported by said local exchange, the method comprising: setting a call forwarding function at said local exchange for incoming calls directed to a main dialling number for a first subscriber, said call forwarding function, when set, forwarding (4c, 5c) said calls to a service platform (312, 404, 504) separate from said local exchange; tnggering (4d, 5d) a first service of said second service type at said service platform for at least some incoming calls forwarded to said service platform by said call forwarding function; forwarding at least some incoming calls from said service platform using an alternate dialling number for said first subscriber back to said local exchange;and directing incoming calls using said alternate dialling number for said first subscriber from said local exchange to the subscriber equipment for said first subscriber, characterised in that: each of the services of the first service type supported by said local exchange has one or more subscriber-configurability features, and by: in response to detecting that a particular service or service setting might cause interoperability problems between the local exchange and the service platform, reconfiguring said local exchange for said first subscriber, said reconfiguring disabling a subscriber-configurability feature on said local exchange for a first service of said first service type, for the main dialling number for said first subscriber. setting a call forwarding function at said local exchange for incoming calls directed to a main dialling number for a first subscriber, said call forwarding function, when set, forwarding (4c, 5c) said calls to a service platform (312, 404, 504) separate from said local exchange; tnggering (4d, 5d) a first service of said second service type at said service platform for at least some incoming calls forwarded to said service platform by said call forwarding function; forwarding at least some incoming calls from said service platform using an alternate dialling number for said first subscriber back to said local exchange;and directing incoming calls using said alternate dialling number for said first subscriber from said local exchange to the subscriber equipment for said first subscriber, characterised in that: each of the services of the first service type supported by said local exchange has one or more subscriber-configurability features, and by: in response to detecting that a particular service or service setting might cause interoperability problems between the local exchange and the service platform, reconfiguring said local exchange for said first subscriber, said reconfiguring disabling a subscriber-configurability feature on said local exchange for a first service of said first service type, for the main dialling number for said first subscriber. each of the services of the first service type supported by said local exchange has one or more subscriber-configurability features, and by: in response to detecting that a particular service or service setting might cause interoperability problems between the local exchange and the service platform, reconfiguring said local exchange for said first subscriber, said reconfiguring disabling a subscriber-configurability feature on said local exchange for a first service of said first service type, for the main dialling number for said first subscriber. in response to detecting that a particular service or service setting might cause interoperability problems between the local exchange and the service platform, reconfiguring said local exchange for said first subscriber, said reconfiguring disabling a subscriber-configurability feature on said local exchange for a first service of said first service type, for the main dialling number for said first subscriber.