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</o:shapelayout></xml><![endif]--></head><body lang=PL link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Recently my company started to migrate into O365 S4B from OnPrem solution (currently working in Hybrid).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I spend some time to get it up and running (including changing Expressway dnsmasq files as Internet DNS SRV still points to OnPrem servers …).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Call flow:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Endopoint --- CUCM – Expressway-C -- CMS – Expressway-C – Expressway-E – Internet (O365 S4B servers)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>We can consider 2 call scenarios:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Conferences hosted in O365 – this are working 100% without any issues<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Conferences hosted OnPrem – during tests working rate was less than 5%<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>What is interesting for point 2, it found out that from O365 S4B server pool IP’s, only 1 was processing calls correctly (others were not responding to SIP Invite so Timeout occurred).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Have any of you encountered such issue? Anyone running S4B Hybrid solution?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Lukasz<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>