Hi,
debian.org is in the progress of enabling a SIP service for the developer community.
Many of the same tools used for debian.org are in Fedora as well. I have been helping get the reSIProcate package into shape for this type of use and I would be happy to help the Fedora community benefit from this. Ideally, we would have a situation where sip:user@debian.org can call sip:user@fedoraproject.org and vice versa.
I understand Fedora does not provide full ISP-like services (e.g. mailboxes) to the community and Debian is much the same. A SIP service would not be a full software PBX like Asterisk or FreeSWITCH. It would simply be a SIP proxy that enables interconnection between project members. If some people want to connect their private Asterisk servers to the SIP proxy they can do that, but there would be no obligation to maintain things like that centrally.
An overview of the project at Debian is in this wiki, I'm quite happy to make a version of this adapted for the Fedora wiki:
https://wiki.debian.org/UnifiedCommunications/DebianDevelopers
I'll be up at FOSDEM in two weeks, so if anybody wants to discuss or work on any aspect of this in person at that time please feel free to get in touch.
Regards,
Daniel