Conducting marriage contract by telephone

I want to get married to a girl but her father is in another country, and at present I cannot travel there for us to be all together, because of financial and other circumstances. I am also in a foreign country. Is it permissible for me to phone her father so that he can say, “I offer you my daughter So and so in marriage,” and I can say, “I accept,” with the consent of the girl and in the presence of two Muslim witnesses who are listening to what he and I say by means of speakers attached to the phone? Would this be considered as a valid marriage contract according to sharee’ah?