Hi, 

I have a question here:

For several ISDN subscribers under one NT,  How they register to SIP Server

I think:

1. For each ISDN subscriber, register message should be like several To URL 
with its unique contact URL, which means several logic SIP/TEL URL now bind 
with the physical eqquipment(Phone or PC or else)

2. If those ISDN subscribers share the same default telephone number. now a 
phone outside calls the number(ISDN subscribers are callee), is it possible to 
distinguish them or not from caller side?  I hear of sub-address may be used? 
how to use it?

Thanks

If you share me the call flow, That will be more helpful. 


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