Question

I’m writing an iPhone application which needs to have an option to call our office. However, the phone number that needs to be dialed has a 5 digit extension.

I know that to call a regular phone number we can use openURL using something like:

[[UIApplication sharedApplication] 
    openURL:[NSURL URLWithString:@"tel:[phone]"]];

Can I get this to work with an extension? If so, how?

The Apple docs link to RFC 2806, which describes the URL scheme for tel: and it seems as though extensions are supported, but I can’t figure out the syntax from the RFC.

Answer 1

Not 100% sure if this is the answer, but from the RFC you linked on page 14:

tel:[phone];postd=pp22

The above URL instructs the local entity to place a voice call to
[phone], then wait for an implementation-dependent time (for
example, two seconds) and emit two DTMF dialing tones “2” on the line
(for example, to choose a particular extension number, or to invoke a
particular service).

Hope this helps.