As Stan said, it is the 11+4 peace framework signed in Addis Abeba that facilitated the involvement of FIB.
But what Stan forgot is the nomination of a UN Special envoy for the Great Lakes + a US Special Envoy for the Great lakes, and the fact that Addis Abeba framework was signed with US, EU, Belgium and France as witness.

In addition, this has sparked a very interresting reorganisation of power in Central and Southern Africa between EAC and SADC.

I put here the link on an interesting article on the M23 ideology:
M23's Congo Cadres: The Rebel Movement with a Taste for Local Politics

During the leadership portion of the training, examples of an eclectic mix of revolutionary heroes are taught. This includes figures ranging from Nelson Mandela to Abraham Lincoln to Che Guevara. (Che Guevara once fought in South Kivu for Laurent Kabila, the late father of the DRC’s current President Joseph Kabila, but this detail is apparently overlooked.)

Training also includes some religious elements, in particular an extensive course on ‘Christian leadership’. “Though M23 is a secular group, we hold up the example of Jesus as a model of leadership and service to a revolutionary cause,” explains one M23 cadre. The head of M23’s armed wing, General Sultani Makenga, is an avowed Seventh Day Adventist and the group’s former leader, Jean-Marie Runiga, styled himself as a bishop.

However, examples from other faith traditions are also drawn upon. Mahatma Gandhi’s Seven Blunders of the World is taught to all cadres, and the example of Gandhi has clearly rubbed off on some M23 members. Political chief Bisimwa currently uses an image of Ghandi on his Twitter profile.

Chris Shambala, a member of M23’s public works department, recalls his experience in the leadership courses. “My favourite figure they told us about in the trainings was Abraham Lincoln,” he says. “That man was a prophet. His vision of America was fulfilled when Obama became president. Like Lincoln, we know that sometimes to fix wrongs in your country, you need a civil war.
http://thinkafricapress.com/drc/m23-...key-grip-power

At the momment US and Eu are calling for a quick peace agreement in Kampala but I really doubt it will ever happen.

DR Congo army in 'last phase' push against M23 rebels after seizing guerrilla stronghold

A source in the UN mission in DR Congo (MONUSCO), which is helping the army, said the offensive against the M23 was in ‘the last phase’, after the army captured the main rebel base at Bunagana on Wednesday.

Diehard M23 fighters, estimated at just a few hundred men, were dug in on three hills in farming territory about 50 miles north of Goma, the capital of strife-torn North Kivu province
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http://www.dailymail.co.uk/news/arti...#ixzz2jOvQDez1

You need to be 2 to negotiate. And at least 1 is not really willing to talk.