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don't seg if tech_pvt isn't there.
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@15837 d0543943-73ff-0310-b7d9-9358b9ac24b2
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@ -3835,7 +3835,7 @@ static void sofia_handle_sip_i_state(switch_core_session_t *session, int status,
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break;
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case nua_callstate_completing:
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nua_ack(nh,
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TAG_IF(!zstr(tech_pvt->user_via), SIPTAG_VIA_STR(tech_pvt->user_via)),
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TAG_IF(tech_pvt && !zstr(tech_pvt->user_via), SIPTAG_VIA_STR(tech_pvt->user_via)),
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TAG_END());
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break;
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case nua_callstate_received:
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