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Audio Codes SBC giving error " failed sending message with CSeq 1 OPTIONS, the cause is Transport Error" RRS feed

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    Hi,
    I am configuring a new SBC with Teams Direct routing. I am getting this below error on SBC. 
    Jun  2 20:25:59 local0.notice [S=155] [SID=1ad507:21:171]  (N       57) AcSIPDialog(#14006)::TransactionFail - ClientTransaction(#27026) failed sending message with CSeq 1 OPTIONS, the cause is Transport Error [Time:02-06@20:25:58.882]
    Jun  2 20:25:42 local0.notice [S=154] [SID=1ad507:21:170]  (N       56) AcSIPDialog(#14007)::TransactionFail - ClientTransaction(#27027) failed sending message with CSeq 1 OPTIONS, the cause is Transport Error [Time:02-06@20:25:41.908]
    Jun  2 20:25:25 local0.notice [S=153] [SID=1ad507:21:168]  (N       55) AcSIPDialog(#14009)::TransactionFail - ClientTransaction(#27029) failed sending message with CSeq 1 OPTIONS, the cause is Transport Error [Time:02-06@20:25:24.887]
    Jun  2 20:25:08 local0.notice [S=152] [SID=1ad507:21:165]  (N       54) AcSIPDialog(#14013)::TransactionFail - ClientTransaction(#27033
    Tuesday, June 2, 2020 8:33 PM

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    Hi Avneet Dabas!

    Does this issue persist all the time?

    Do you have any operations before this issue occurred?

    It recommends you try to check if you meet these pre-requisites in AudioCodes SBC.

    *AudioCodes SBC should running at least version 7.20A.250 or above

    *SBC Sessions and Microsoft Teams license should be installed

    *Make sure you allow the following ports that the SBC uses


    For more details about detailed pre-requistes in SBC, you can refer to:

    https://www.lee-ford.co.uk/teams-direct-routing-with-an-audiocodes-sbc/

     

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    Best Regards,
    Jimmy Yang
    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.
    Wednesday, June 3, 2020 7:30 AM
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    Hello, this tends to be either that the destination is unreachable, either due to a firewall or the incorrect port/protocol being specified or you need to make sure the SSL certificate containing the FQDN of your SBC (sbc.domain.com) has been applied to the correct IP Group. Thanks.

    ------------------

    https://www.siplifi.com | @SiplifiGroup
    Wednesday, June 3, 2020 7:48 AM
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    Hi,
    Is there any update on this case?
    Please feel free to drop us a note if there is any update.
    Have a nice day!

    Best Regards,
    Jimmy Yang

    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

    Wednesday, June 10, 2020 10:02 AM