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Tel URI formats and device IDs

The preferred format is E.164, except in cases where the extension bears no resemblance to the E.164 number.

Table 1. Tel URI formats supported by AE Services
Format Example
E.164 tel:+13035389000
E.164PlusExt tel:+13035389000;ext=1234
extOnly tel:5389000;phone-context=<domain>

where <domain> can be any organization’s domain name

tel:5380112;phone-context=example.com