I had a missed call from this number recently and the caller stayed on the phone leaving a message without talking. You could hear people speaking in Chinese in the background. For some reason, I thought this call was a little odd. So, if they call again I will ignore there calls.
October 22,2009

Caller called and spoke in my mother tongue, Tamil and said that Telus has received complaints about our phone being used by Telemarketers. My husband asked what is your ID and call back number and he gave his Telus ID as 08 TEL 619 and gave 1 +1 866-585-1111 as a call back number. My husband said that he would call him back and hung up. I did google search on this number and got this thread.
Previously there were calls from a Nebraska or Utah number who would just keep silent whenever we pick up. We stopped picking up calls from unknown numbers . But, this number caught us by surprise.

(604) 628-2598 called twice at six am.  Fax ring, but no fax received.  Suspect fax telemarketing.

I got a call today, I heard a lot of "call centre" noise behind, so I thought it was a telemarketer, their offer was to lower my credit card and mortage interest to 2.5%, I did hear this guy but then he started asking for personal information, I that point I just hung up. Best case is a telemarketer trying to have more valuable lists to sell, worst case there is an identity theft scheme going on...

Has called me a couple times, doesn't respond and doesn't leave a message. Probably a gay.

I think it is a routing number in Metro Vancouver, BC for overseas calls. I just received a genuine call from my friend's land line in El Salvador, Central America to my cell phone in Vancouver and it showed (604) 628-2598.