Hi, Thanks for that link but the other thing is the below line where zoiper sends a crypto that looks alike but the placement of characters is different so doesn't match so is zoiper doing it wrongly or it's a total different crypto that FS doesn't support switch_core_media.c:1479 looking for crypto suite [AES_CM_192_HMAC_SHA1_32] in [4 AES_192_CM_HMAC_SHA1_32 On March 15, 2018 4:15:59 PM Jurijs Ivolga <jurijs.ivolga@gmail.com> wrote: Hi, Have you checked this: https://freeswitch.org/confluence/display/FREESWITCH/rtp_secure_media With kind regards, Jurijs On Thu, Mar 15, 2018 at 2:03 PM, Bipin Patel <bipin@xbipin.com> wrote: hi, is it possible to force a selected crypto for SRTP as i cant seem to find a way to force a crypto to the user such that is phone uses that for media, secondly i see zoiper sends the below in SDP a=crypto:5 AES_256_CM_HMAC_SHA1_80 inline:854nJNIKSyhr0sJs+Ol+Qv2eSqC2gnydK8iVHUAXb4Xx7oW8iMM2jVi7R9xV6A== a=crypto:6 AES_256_CM_HMAC_SHA1_32 inline:854nJNIKSyhr0sJs+Ol+Qv2eSqC2gnydK8iVHUAXb4Xx7oW8iMM2jVi7R9xV6A== a=crypto:3 AES_192_CM_HMAC_SHA1_80 inline:854nJNIKSyhr0sJs+Ol+Qv2eSqC2gnydK8iVHUAXb4Xx7oW8iMM= a=crypto:4 AES_192_CM_HMAC_SHA1_32 inline:854nJNIKSyhr0sJs+Ol+Qv2eSqC2gnydK8iVHUAXb4Xx7oW8iMM= a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:854nJNIKSyhr0sJs+Ol+Qv2eSqC2gnydK8iVHUAX a=crypto:2 AES_CM_128_HMAC_SHA1_32 inline:854nJNIKSyhr0sJs+Ol+Qv2eSqC2gnydK8iVHUAX where as FS always uses the below only switch_core_media.c:1484 Found suite AES_CM_128_HMAC_SHA1_80 and also i noticed FS and zoiper have some variations in crypto names such as switch_core_media.c:1479 looking for crypto suite [AES_CM_192_HMAC_SHA1_32] in [4 AES_192_CM_HMAC_SHA1_32 and this never matches and never used at all (notice the placement of CM_192 in FS whereas zoiper has 192_CM) -- Regards, Bipin _________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org _________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org