This patch appears to be relevant as well: https://bugs.freedesktop.org/attachment.cgi?id=85203

Unfortunately, this is not easily backportable to the telepathy-gabble in squeeze, but it applies (with fuzz) to Harmattan's version. So if somebody wants to try (and hoping one can replace telepathy-gabble with a new .deb), this might work (possibly along with the other patch above).