[Freeswitch-users] SRTP crypto selection

[Bipin Patel]

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


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