Hello. Probably this bug is the same as in Ubuntu Saucy. My bug report is here: https://bugs.launchpad.net/ubuntu/+source/sofia-sip/+bug/1246171
The reason is gcc 4.8. Jessie/sid use gcc 4.8, while Wheezy use gcc 4.7. Disabling "aggressive-loop-optimizations" for gcc 4.8 solves problem with sofia-sip for Ubuntu Saucy. Simon, can you try to recompile sofia-sip with "-fno-aggressive-loop-optimizations"? -- Ilya Melnikov