Google using Time Warner Telecom for VoIP?

I stumbled across an interesting piece of information tonight while watching ARIN (American Registry for Internet Numbers).  ARIN controls the assigning of IP addresses in North America, so it can be a good way to keep an eye on companies you are interested in.  Doing a search for "Google" lead to some interesting results.  On November 22 they were assigned a block of IP addresses belonging to Time Warner Telecom for their own use as seen here:

CustName:   Google
Address:    2375 E Camelback Rd
City:       Phoenix
StateProv:  AZ
PostalCode: 85016
Country:    US
RegDate:    2005-11-22
Updated:    2005-11-22
NetRange:   64.128.207.160 - 64.128.207.175
CIDR:       64.128.207.160/28
NetName:    TWTC-GOOGLE-01
NetHandle:  NET-64-128-207-160-1
Parent:     NET-64-128-0-0-1
NetType:    Reassigned
Comment:    
RegDate:    2005-11-22
Updated:    2005-11-22
RTechHandle: ZT87-ARIN
RTechName:   Time Warner Telecom
RTechPhone:  +1-800-898-6473
RTechEmail:  ipmanager@twtelecom.net

It is rumored that Google has started testing "Click-to-Call" which links potential buyers to advertisers via phone, but the "third party" who provides the communication services is still unknown.  Could it be Time Warner Telecom who will be providing VoIP services for Google's Click-to-Call service?  Or could it simply be for internal communications to handle the 600 employees that will be operating out of Phoenix? 

If it is for internal communications, I found it strange that other Google offices don't have IP addresses of the same kind, so I did some more investigation. 

Mountain View, New York, Kirkland, Santa Monica, Phoenix: they all have employees, but only Phoenix has a "link" to Time Warner Telecom. Interestingly, there are job postings in all of these Google locations for VoIP-types, but they all mention Avaya.  To me, this suggests that for internal communications they have been using services from Avaya for a while now.  Other VoIP providers could potentially be used for Google services like GTalk and/or Click-to-Call which is being tested in some parts of the United States.

I would bet these IPs are not simply for internal communications, they are for something much more important as Google digs deeper into VoIP.  Lets see what happens!