Thursday, 25 August 2011

Who owns the cloud?

If the thought of storing critical, personal or sensitive information in a place that to all intents and purposes is completely out of your control makes you feel a tad uneasy – you’re not alone.  Using the cloud, particularly in relation to data, is a bone of contention, but there are options for you to choose from, each with its own merits.

The last blog introduced the idea that services (IaaS, PaaS and CaaS) can be deployed in three different types of cloud - private, public or hybrid (there are more variations out there, but those are the key ones for you to consider at this early stage).  Which is the best option for you, really depends on what you’re looking to achieve.  It may be useful to think about your top priorities, for example, ‘risk aversion’ or ‘cost reduction’?

Tuesday, 16 August 2011

Dealing with RTP loss

In a post last month, you read about SIP call recovery from RTP loss. This post continues the theme, providing some more useful information – detecting and dealing with RTP loss between two SIP end points.

If you recall the scenario, there is a gateway installed between an SS7 carrier network and an emergency services IP network – an ESInet – over which emergency calls are routed to public safety answering points (PSAPs). Calls entering the ESInet via the gateway are SIP/RTP/UDP and, as the NENA i3 specification quite rightly states, in no circumstances should an in-progress emergency call be taken down automatically, just because RTP streams fail.