"Ext" in a phone number


Hello everyone,

I need to call a British company to ask them a few questions, and on their website they give a phone number with the mention "Ext 55", which should reach a French-speaking hotline - which I'd obviously prefer given that my questions are going to be quite technical and I sure am not confident enough to have a discussion over the phone for such topics.

Would any of you happen to know what this "Ext 55" means ? Here's the exact context :
Tél +44 1767 626444 Ext 55
(Pour aide-technique et renseignements
en français)

And for those who'd be curious, the company is London Electronics Limited.

Is it something like I must dial the number then add 55 once I have the line ? Or that I should replace the last two digits (44) by 55 ?

Thank you very much for your answers !
  • researcher616

    American English
    Ext stands for "extension." Most likely, when you dial the number (ending with 6444), a live person or a recording will ask you for an extension number. Then, you either say or hit 55 on your telephone.