ZBW Controller described a N90 airspace entry when an aircraft failed to turn as directed because of weather deviations; the reporter noting several attempts to contact N90 were unsuccessful.

Narrative

I was in the control room working as the FLM standing behind the controllers involved. They had called my attention to the event because they could not contact the N90 to coordinate a CRJ deviating around weather towards the Liberty East airspace of N90. The RADAR Controller made several attempts to contact the N90 Controller with no success. Then the RADAR Associate made several more calls as the RADAR Controller attempted to encourage the aircraft to turn right to avoid N90 airspace with no success. I then contacted the N90 FLM via dial land line and requested he have the Liberty East Controller contact the DXR Sector. By this time the aircraft had already entered the N90 airspace. Recommendation; this communications problem is an on going issue. On numerous occasions when this issue arises we must call the N90 FLM to have them 'turn up the speaker'. This is the common reason given by N90 FLM. Suggested fix: If land line checks were periodically accomplished on this land line we could identify the speaker issue before it becomes time critical.