Put a comma between the main telephone number and the extension, and put the abbreviation Ext. before the extension number.
- Please contact Lisa Steward at 613-555-0415, Ext. 126.
In formal correspondence, you may write Extension out in full.
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© His Majesty the King in Right of Canada, represented by the Minister of Public Services and Procurement
A tool created and made available online by the Translation Bureau, Public Services and Procurement Canada
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