To get the external phone for an Inesc-Id (in Lisbon) extension of the form 2xxx, use +(351) 213100xxx. Inesc-Id (in TagusPark) extensions are trickier. If 50xx, use +(351) 2142332xx, if 51xx, use +(351) 2142335xx, and if 52xx, use +(351) 210407xx, but there may be exceptions. In doubt, you can give the extension after digit the general numbers, 21310300 (Lisbon) or 214233290 (Tagus), or you may get more information clicking the personal link.
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