tel: link w/ extension working on iOS but not Android

Question

I have a link that looks something like:

<a href = "tel:1234567890pp2149">Call Support</a>

This link works perfectly fine when using an iOS device. When clicking the link while on Android however the phone attempts to dial 1234567890 (the number without the extension). What is the proper way to do this so that it will work across devices

Answer 1

This appears to be a known bug/issue which may be due to the lack of standards around this feature, as comma,'W','P' are all specific implementations which could change as the Manufacturer may switch out the standard dialer for their own.

http://code.google.com/p/android/issues/detail?id=13684

Answer 2

Try commas instead of 'p' for the pauses. I believe Android's pause character is a comma.