telepathy-sofiasip is version 0.6.3-1~ppa10.04+1. The same behaviour (although not debugged) happens with version 0.6.2-devel on the N900 libsofia-sip-ua0 is version 1.12.10-4 The OPTION keepalive packages sent by telepathy are not correctly recognized by e.g. sipgate.de's proxy server, when the server requires proxy authentication. Telepathy so far does not seem to offer proxy authentication and those keep alive packages are getting refused with a 407 error. Without keep alive packages, the connection sooner or later is considered as closed from the server side.
Strange, I can see the code in sofia-sip that should restart the OPTIONS request with authentication on a 407 error code. I don't have an account at sipgate.de and I have trouble registering at the German-language website :) Can you collect debug logs (the "sofiasip" log view in Empathy) while running telepathy-sofiasip with TPSIP_PERSIST=1 NUA_DEBUG=5 TPORT_LOG=1 in its environment and connected to sipgate.de?
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