[asterisk-security] asterisk srtp config problem

[golge yolcu]

Asterisk SRTP config

i installed asterisk with srtp. i have configured sip.conf and
extensions.conf like

extensions.conf
main
exten => 600,1,Set(_SIPSRTP=optional)
exten => 600,n,Set(_SIPSRTP_CRYPTO=enable)
exten => 600,n,Playback(demo-echotest) ; Let them know what's going on
exten => 600,n,Echo ; Do the echo test
exten => 600,n,Playback(demo-echodone) ; Let them know it's over
exten => 600,n,hangup

exten => 610,1,Set(_SIPSRTP=require)
exten => 610,n,Set(_SIPSRTP_MIKEY=enable)
exten => 610,n,Playback(demo-echotest) ; Let them know what's going on
exten => 610,n,Echo ; Do the echo test
exten => 610,n,Playback(demo-echodone) ; Let them know it's over
exten => 610,n,hangup


exten => 700, 1, Set(_SIP_SRTP_SDES=1)
exten => 700, n, Set(_SIPSRTP=optional)
exten => 700, n, Set(_SIPSRTP_CRYPTO=enable)
exten => 700, n, Dial(SIP/700)

exten => 701, 1, Set(_SIP_SRTP_SDES=1)
exten => 701, n, Set(_SIPSRTP=optional)
exten => 701, n, Set(_SIPSRTP_CRYPTO=enable)
exten => 701, n, Dial(SIP/701)

sip.conf

700
type=friend
username=700
context=main
host=dynamic
secret=700
canreinvite=no
nat=yes

701
type=friend
username=701
context=main
host=dynamic
secret=701
canreinvite=no
nat=yes

and i used grandstream GXP2020 telephones. when i dial 600 it is succesful
and i am getting my echo but when i dial 700 it says call failed reason code
: 603

Is there anybody who can help me.
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