RFC 2806bis: tel URI Henning Schulzrinne Columbia University - - PowerPoint PPT Presentation

RFC 2806bis: tel URI

Henning Schulzrinne Columbia University hgs@cs.columbia.edu IPTEL working group IETF 55 (November 2002, Atlanta)

Status - 06

• Changes:

– URI comparisons CI, but use lower-case parameters – BNF clean-up: component names, avoid parameter ordering constraints – recommended parameter ordering

• technically, seems to have converged

WGLC?

• may need editorial clean-up

Open issue: context

• currently, two approaches:

– DNS: tel:7042;phone-context=cs.columbia.edu – prefix: tel:863-1234;phone-context=+1-914-784

• many choices for context
• do we need to recommend one

– lowest number in range longer than necessary in most cases – smallest prefix not always unique if not divided by digit

– or prefix list: ;phone-context=+31,+49

• is this useful?
• e.g., European 0800 numbers?

Open issue: global numbers

• Global numbers are tel:+CC-something
• unlike local numbers, require no context
• freephone (“800”) numbers are perceived

as global, but are local

– regardless of what spec will say, people will write tel:+1-800-356-9377

Draft progression

• Planned for Draft Standard
• Need interoperability matrix
• ;context implementations?