Asterisk 13 to be in raspberry pi but not chan_dongle
Asterisk 13, which is an LTS version, has been released recently. A first build can be found in the repository. Upgrading from Asterisk 11 is possible with these commands:
apt-get update
amportal stop
apt-get purge asterisk11
apt-get install asterisk13
amportal start
Basic call setup works fine so far, but it still needs to be more tested. Also chan_dongle is not yet supported at this time.