The dialogue liaison committee revealed plans to meet with the parties which did not sign a West-backed power-transfer deal after the 2011 events, the Southern Movement, Harak, and the Yemeni opposition abroad to encourage them to participate in a comprehensive national dialogue.
The dialogue is expected to take place in the next few months.
So far, the committee has met with the Shiite Houthi Group and women's groups and there are also plans to meet with the youth-led protests inside the change and freedom squares.
It held a meeting on Tuesday, which was attended by the Russian ambassador and deputy ambassador t o the EU to Sanaa as well as UN political experts.
"We are communicating the Southern Movement in Aden and a meeting is expected very soon," a spokesperson at the committee said.
The meeting with the parties, which were not part of the transition deal, takes place on June 12 to discuss their representation and participation in the dialogue, the spokesperson said.
On June 20, a meeting will be held with the Yemeni opposition abroad in the Egyptian capital Cairo , the source said, pointing out that the committee and the ministerial liaison committee in charge with contacting with the youth-led protesters have agreed to start arrangements to meet with the protesters. "Meetings with the protesters including different political groups across the republic takes place on June 18".
The preparations for the dialogue have got underway amid big challenges including alarming security disorders and an intensified offensive against Al-Qaida militants, an unprecedented humanitarian crisis and persistent social unrest.
Earlier, observers said there should be suitable measures and efforts to make any dialogue a success in Yemen, after the 2011 uprising which ousted the former regime.