[SR-Users] Recent problem with fix_nated_sdp and kamailio 4.4.4

[Anthony Messina]

Prior to the upgrade to Kamailio 4.4.4, I was using 4.4.3 with updates  
through 81df84b from the 4.4 branch and the following fix_nated_sdp  
call worked through the initial INVITE and when a voicemail branch was  
appended from the failure_route.

route[NATMANAGE] {
...

# RTPEngine is not needed but if STUN addresses are being used on our
# internal network, rewrite the addresses to the internal source address
if(!isbflagset(FLB_RTPENGINE) && has_body("application/sdp")) {
         if(dst_ip==10.1.1.2 &&  
compare_pure_ips($sel(contact.uri.host), "<EXTERNAL_IP>")) {
                 fix_nated_sdp("10");
         }
}

...
}

Since the upgrade to 4.4.4, when the original INVITE fails over to  
voicemail (branch appended), fix_nated_sdp creates the SDP below,  
doubling the replaced IP addresses.  Asterisk replies with 488, as the  
media address is completely invalid.  I need something like the above  
(which worked for the request and the reply) but can't figure out what  
the problem is.

v=0
o=Zoiper 0 0 IN IP4 10.1.1.18210.1.1.182
s=Zoiper
c=IN IP4 10.1.1.18210.1.1.182
t=0 0
m=audio 63732 RTP/SAVP 9 3 0 97 101
a=rtpmap:9 G722/8000
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:97 iLBC/8000
a=fmtp:97 mode=30
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=sendrecv
a=crypto:5 AES_256_CM_HMAC_SHA1_80  
inline:n2C0BcdXOr32BPTEE8pfHII9mamAK566xMNvQIDIGKI2LPOLdNDOcpFdtqu5DQ==
a=crypto:6 AES_256_CM_HMAC_SHA1_32  
inline:n2C0BcdXOr32BPTEE8pfHII9mamAK566xMNvQIDIGKI2LPOLdNDOcpFdtqu5DQ==
a=crypto:3 AES_192_CM_HMAC_SHA1_80  
inline:n2C0BcdXOr32BPTEE8pfHII9mamAK566xMNvQIDIGKI2LPOLdNA=
a=crypto:4 AES_192_CM_HMAC_SHA1_32  
inline:n2C0BcdXOr32BPTEE8pfHII9mamAK566xMNvQIDIGKI2LPOLdNA=
a=crypto:1 AES_CM_128_HMAC_SHA1_80  
inline:n2C0BcdXOr32BPTEE8pfHII9mamAK566xMNvQIDI
a=crypto:2 AES_CM_128_HMAC_SHA1_32  
inline:n2C0BcdXOr32BPTEE8pfHII9mamAK566xMNvQIDI
a=oldmediaip:<EXTERNAL_IP>
a=oldmediaip:<EXTERNAL_IP>
a=oldmediaip:<EXTERNAL_IP>
a=oldmediaip:<EXTERNAL_IP>


-- 
Anthony - https://messinet.com/ - https://messinet.com/~amessina/gallery
F9B6 560E 68EA 037D 8C3D  D1C9 FF31 3BDB D9D8 99B6
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