have mod_sofia always elect to be the session refresher so we know it will work,…

have mod_sofia always elect to be the session refresher so we know it will work, also make the session-expires set to 0 imply 100% disabled session timers

src/mod/endpoints/mod_sofia/mod_sofia.c

@@ -723,7 +723,7 @@ static switch_status_t sofia_answer_channel(switch_core_session_t *session)
 						TAG_IF(sticky, NUTAG_PROXY(tech_pvt->record_route)),
 						TAG_IF(cid, SIPTAG_HEADER_STR(cid)),
 						NUTAG_SESSION_TIMER(session_timeout),
-						TAG_IF(session_timeout, NUTAG_SESSION_REFRESHER(nua_remote_refresher)),
+						NUTAG_SESSION_REFRESHER(session_timeout ? nua_local_refresher : nua_no_refresher),
 						SIPTAG_CONTACT_STR(tech_pvt->reply_contact),
 						SIPTAG_CALL_INFO_STR(switch_channel_get_variable(tech_pvt->channel, SOFIA_SIP_HEADER_PREFIX "call_info")),
 						SOATAG_USER_SDP_STR(tech_pvt->local_sdp_str),
@@ -739,7 +739,7 @@ static switch_status_t sofia_answer_channel(switch_core_session_t *session)
 						TAG_IF(sticky, NUTAG_PROXY(tech_pvt->record_route)),
 						TAG_IF(cid, SIPTAG_HEADER_STR(cid)),
 						NUTAG_SESSION_TIMER(session_timeout),
-						TAG_IF(session_timeout, NUTAG_SESSION_REFRESHER(nua_remote_refresher)),
+						NUTAG_SESSION_REFRESHER(session_timeout ? nua_local_refresher : nua_no_refresher),
 						SIPTAG_CONTACT_STR(tech_pvt->reply_contact),
 						SIPTAG_CALL_INFO_STR(switch_channel_get_variable(tech_pvt->channel, SOFIA_SIP_HEADER_PREFIX "call_info")),
 						SIPTAG_CONTENT_TYPE_STR("application/sdp"),

src/mod/endpoints/mod_sofia/sofia_glue.c

@@ -2342,7 +2342,7 @@ switch_status_t sofia_glue_do_invite(switch_core_session_t *session)
 		nua_invite(tech_pvt->nh,
 				   NUTAG_AUTOANSWER(0),
 				   NUTAG_SESSION_TIMER(session_timeout),
-				   TAG_IF(session_timeout, NUTAG_SESSION_REFRESHER(nua_remote_refresher)),
+				   NUTAG_SESSION_REFRESHER(session_timeout ? nua_local_refresher : nua_no_refresher),
 				   TAG_IF(sofia_test_flag(tech_pvt, TFLAG_RECOVERED), NUTAG_INVITE_TIMER(UINT_MAX)),
 				   TAG_IF(invite_full_from, SIPTAG_FROM_STR(invite_full_from)),
 				   TAG_IF(invite_full_to, SIPTAG_TO_STR(invite_full_to)),