Enterasys Networks customers should be encouraged that the joint venture between Enterasys owner Gores Group and Siemens strengthens the vendor's product portfolio and financial wherewithal.

Gores and Siemens this week entered into a joint venture in which Gores acquired a controlling stake in Enterprise Communications group, the No. 4 vendor in VoIP equipment worldwide, according to Dell'Oro Group. Gores plans to combine Enterasys and its SER Systems call-center company with Siemens Enterprise Communications to form a $5 billion provider of VoIP systems and Ethernet switches for enterprises.

View our slide show of 2008's hottest tech M&A deals.

The joint venture should present a more formidable challenge to Cisco's enterprise dominance and satisfy Enterasys' stated goal of more than doubling in size to become  a more credible alternative to the networking giant.

Existing Enterasys users should be heartened by the plan, says Rob Whiteley of Forrester Research.

"I think Enterasys customers should be thrilled," Whiteley says. "Enterasys was taken private [in 2006] and has pretty much remained silent for quite a long time. Given some of the financial viability concerns, I think a lot of current customers wanted any sign that there was light at the end of the Gores Group tunnel. Siemens provides the brand, some cash and a promise for a more stable revenue stream," he says.

Click to see: Chart of Gores acquisitions

"I don't really see any problem for customers," says Steve Schuchart of Current Analysis. "If anything, it means that Gores is more committed to Enterasys than ever. They kind of need [Enterasys] to make the whole thing work," he says.

Zeus Kerravala of The Yankee Group also believes Enterasys customers should be encouraged by the deal. There is always the potential for downside, however, he notes. Siemens has a professional services group that does a significant amount of business with Cisco and Cisco customers, he says. Also, Siemens' HiPath and OpenScape IP telephony systems most likely ride on Cisco networks.

"Siemens has got to be careful how much they position Enterasys as part of the [VoIP] solution," Kerravala says. "That could be a deterrent" for enterprises heavily entrenched in Cisco infrastructure, he says.

Forrester's Whiteley says the joint venture's challenge will come in convincing new customers to adopt its vision and products.