asterisk users - Aug 2014 - Asterisk 11.11 with TCP/TLS SRTP and Grandstream gxp1450 not working

Hey there

i'm trying to get an Asterisk 11.11 with encryption working with my
Grandstream phones. But i stuck.

To avoid NAT problems i'm using IPv6

Just with TCP/TLS it's working fine. Only the SRTP funktion is not working.

Asterisk tells me

WARNING[6938]: chan_sip.c:3906 __sip_xmit: sip_xmit of 0x7fa10800f5a0
(len 681) to [2a02:1205::...]:37635 returned -2: Success

and also

SSL certificate ok
  == Problem setting up ssl connection: error:14077410:SSL
routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure
WARNING[7421]: tcptls.c:668 handle_tcptls_connection: FILE * open failed!


Encryption is configured via

;-------------------------Encryption-----
encryption=yes
tlsenable=yes
tlsbindaddr=::
tlscertfile=/var/lib/asterisk/keys/asterisk.pem
tlscafile=/var/lib/asterisk/keys/ca.crt
tlscipher=ALL
srtpcapable=yes
;tlsclientmethod=tlsv1
tlsdontverifyserver=yes


and the phone is sourced by

context=default                 ; Default context for incoming calls
allowoverlap=no
udpbindaddr=::
tcpenable=yes
tcpbindaddr=::
srvlookup=yes

and

[IPV6](!,my-codecs)
dtmfmode=rfc2833
context=sip-out
type=friend
host=dynamic
transport=tls
encryption=yes
nat=no
qualify=yes


the phone it's self contains

[200](IPV6)
context=abc
callerid=123
defaultuser=123
fromuser=123
secret=secret
mailbox=123 at default


The rtp ports are defined via

rtpstart=15000
rtpend=20000


and the Firewall is open at TCP 5061 and udp 15000:20000


what did i miss in my configuration?


Best Regards Jakob

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