Speaking at the NetEvents symposium in Evian today, Alireza Mahmoodshahi, chief technology officer at Colt, told delegates: "An NGN by itself whether from Colt or BT that does not take seriously interoperability with other carriers will just not cut it.
"As the world becomes more globalised we need to work better with each other. "
Roger Ward, president of the MultiService Forum, and an officer of the CEO at BT, added: "Interoperability is key to making NGNs work. We are at that point in time when we have reached a paradigm shift.
"For BT's 21C we are investing £5bn ($12.50m)over five years. This is a massive investment and there can be no going back. Standards are key to that but standards are not going far enough. We need interoperability agreements between vendors."
However, Dean Bubley, analyst and founder of Disruptive Analysis, argued that telcos need to broaden their horizons and consider interoperability with the internet and not just other operators.
"Standards are desirable but not always essential. Just look at Skype and Google. There is an elephant in the room in the form of the internet. NGNs need to interoperate not just with other NGNs, but with the internet and the enterprise," he said.
"I would argue that it is more important for BT to interoperate with Skype rather than, for example, an NGN from Telecom Bolivia."
Mac Taylor, founder and chief executive at Moriana Group, pointed out that deployment of NGNs depends on more than just technology.
"In some respects the future of NGNs is more dependent on personal career paths within an organisation and cultural road blocks, rather than just technology," he said.
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