ContactPointSystem

This code system http://hl7.org/fhir/contact-point-system defines the following codes:

Code	Display	Definition
phone	Phone	The value is a telephone number used for voice calls. Use of full international numbers starting with + is recommended to enable automatic dialing support but not required.
fax	Fax	The value is a fax machine. Use of full international numbers starting with + is recommended to enable automatic dialing support but not required.
email	Email	The value is an email address.
pager	Pager	The value is a pager number. These may be local pager numbers that are only usable on a particular pager system.
url	URL	A contact that is not a phone, fax, pager or email address and is expressed as a URL. This is intended for various personal contacts including blogs, Skype, Twitter, Facebook, etc. Do not use for email addresses.
sms	SMS	A contact that can be used for sending an sms message (e.g. mobide phones, some landlines)
other	Other	A contact that is not a phone, fax, page or email address and is not expressible as a URL. E.g. Internal mail address. This SHOULD NOT be used for contacts that are expressible as a URL (e.g. Skype, Twitter, Facebook, etc.) Extensions may be used to distinguish "other" contact types.