Hi,

i am using currenct git trunk for some SBC-tests.
I use the SDP-Filter and -anonmization features SEMS in my SBC-Profile, e.g.:
sdp_filter=whitelist
sdpfilter_list=G722,pcma,pcmu,telephone-event
sdp_anonymize=yes

I've noticed the following two things:
- the generated SDP has two "a=sendrecv" lines?!? (it seems, some
endpoints have trouble with this)
- docs says, the SDP is regenerated; but SEMS passes through some
"a="-lines, which are not required, e.g. "a=crypto:" or
"a=nortpproxy:yes.". Is it wanted this way?

My Incoming INVITE:
~~~~~~~~~~~~~~~~~~~
U 2012/01/18 15:51:42.760177 84.252.101.17:5060 -> 84.252.101.19:5060
INVITE sip:258@localhost SIP/2.0.
[....]
Content-Type: application/sdp.
Content-Length: 368.

v=0.
o=root 78063860 78063860 IN IP4 84.252.101.18.
s=call.
c=IN IP4 84.252.101.18.
t=0 0.
m=audio 59676 RTP/AVP 0 8 9 101.
a=crypto:1 AES_CM_128_HMAC_SHA1_32
inline:3JWkWLVkD8TPM5ynSVC50Xa96ffNVSqAhEpgvdQQ.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:9 G722/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=ptime:20.
a=sendrecv.
a=nortpproxy:yes.

My Outgoing INVITE:
~~~~~~~~~~~~~~~~~~~
U 2012/01/18 15:51:42.761558 84.252.101.19:5060 -> 84.252.101.17:5060
INVITE sip:258@localhost SIP/2.0.
[...]
Content-Type: application/sdp.
Content-Length: 377.
.
v=0.
o=- 78063860 78063860 IN IP4 84.252.101.18.
s=call.
c=IN IP4 84.252.101.18.
t=0 0.
m=audio 59676 RTP/AVP 0 8 9 101.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:9 G722/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=sendrecv.
a=crypto:1 AES_CM_128_HMAC_SHA1_32
inline:3JWkWLVkD8TPM5ynSVC50Xa96ffNVSqAhEpgvdQQ.
a=ptime:20.
a=sendrecv.
a=nortpproxy:yes.

Kind regards and thanks for the great work so far,
Carsten


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