For gabble 0.16.4.1, initiating an empathy-call causes gabble to segfault.
I get the following backtrace on launching empathy-call:


Program received signal SIGTRAP, Trace/breakpoint trap.
0x00799cdf in g_logv (log_domain=0x65aa6f "GLib-GIO", log_level=G_LOG_LEVEL_CRITICAL, format=0x81c4b8 "%s: assertion `%s' failed", args1=0xbfffe7cc "\200\253e")
    at gmessages.c:758
758			G_BREAKPOINT ();

(gdb) bt full
#0  0x00799cdf in g_logv (log_domain=0x65aa6f "GLib-GIO", log_level=G_LOG_LEVEL_CRITICAL, format=0x81c4b8 "%s: assertion `%s' failed", args1=0xbfffe7cc "\200\253e")
    at gmessages.c:758
        domain = 0x0
        data = 0x0
        depth = 1
        log_func = 0x8068020 <log_handler>
        domain_fatal_mask = 5
        masquerade_fatal = 0
        test_level = 10
        was_fatal = 0
        was_recursion = 0
        i = 3
#1  0x00799d85 in g_log (log_domain=0x65aa6f "GLib-GIO", log_level=G_LOG_LEVEL_CRITICAL, format=0x81c4b8 "%s: assertion `%s' failed") at gmessages.c:792
        args = 0xbfffe7cc "\200\253e"
#2  0x00799dc8 in g_return_if_fail_warning (log_domain=0x65aa6f "GLib-GIO", pretty_function=0x65ab80 "g_async_initable_real_init_finish", 
    expression=0x65aaac "g_simple_async_result_is_valid (res, G_OBJECT (initable), g_async_initable_real_init_async)") at gmessages.c:801
No locals.
#3  0x0055e7d1 in g_async_initable_real_init_finish (initable=0x83fe000, res=0x83dd070, error=0xbfffe880) at gasyncinitable.c:295
        simple = 0xb76032f8
        __PRETTY_FUNCTION__ = "g_async_initable_real_init_finish"
#4  0x0055e611 in g_async_initable_init_finish (initable=0x83fe000, res=0x83dd070, error=0xbfffe880) at gasyncinitable.c:256
        iface = 0x83cb038
        __PRETTY_FUNCTION__ = "g_async_initable_init_finish"
#5  0x08094e3e in call_channel_initialized (source=0x83fe000, res=0x83dd070, user_data=0x83b8b70) at media-factory.c:333
        mcr = 0x83b8b70
        priv = 0x81dd210
        error = 0x0
#6  0x005ad3db in g_simple_async_result_complete (simple=0x83dd070) at gsimpleasyncresult.c:775
        current_source = 0x81b3ad0
        current_context = 0x818c4e8
        __PRETTY_FUNCTION__ = "g_simple_async_result_complete"
#7  0x005ad425 in complete_in_idle_cb (data=0x83dd070) at gsimpleasyncresult.c:787
        simple = 0x83dd070
#8  0x00793651 in g_idle_dispatch (source=0x81b3ad0, callback=0x5ad3f1 <complete_in_idle_cb>, user_data=0x83dd070) at gmain.c:4781
No locals.
#9  0x00790ffa in g_main_dispatch (context=0x818c4e8) at gmain.c:2691
        dispatch = 0x793607 <g_idle_dispatch>
---Type <return> to continue, or q <return> to quit---
        was_in_call = 0
        user_data = 0x83dd070
        callback = 0x5ad3f1 <complete_in_idle_cb>
        cb_funcs = 0x8864d0
        cb_data = 0x81dd990
        need_destroy = 1
        current_source_link = {data = 0x81b3ad0, next = 0x0}
        source = 0x81b3ad0
        current = 0x8195850
        i = 1
        __PRETTY_FUNCTION__ = "g_main_dispatch"
#10 0x00791ab8 in g_main_context_dispatch (context=0x818c4e8) at gmain.c:3195
No locals.
#11 0x00791ca3 in g_main_context_iterate (context=0x818c4e8, block=1, dispatch=1, self=0x8187880) at gmain.c:3266
        max_priority = 0
        timeout = 0
        some_ready = 1
        nfds = 4
        allocated_nfds = 6
        fds = 0x83bd978
#12 0x0079211d in g_main_loop_run (loop=0x8190648) at gmain.c:3460
        self = 0x8187880
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#13 0x002ac5b4 in tp_run_connection_manager (prog_name=0x8120abf "telepathy-gabble", version=0x8120ab6 "0.16.4.1", construct_cm=0x8067f28 <construct_cm>, argc=1, 
    argv=0xbfffeb94) at run.c:285
        connection = 0x8189ae8
        bus_daemon = 0x818dc58
        error = 0x0
        ret = 1
        __PRETTY_FUNCTION__ = "tp_run_connection_manager"
#14 0x080682f6 in gabble_main (argc=1, argv=0xbfffeb94) at gabble.c:182
        loader = 0x8187048
        out = 134644064
        fatal_mask = 13
#15 0x08067f24 in main (argc=1, argv=0xbfffeb94) at main.c:33
No locals.