[Serusers] Got Error in Nathelper "extract_mediaip: no `c=' in SDP"

[Markus Monka]

While receiving "183 Session Progress" from PBX-Gateway 
i got this Error:

ERROR: extract_mediaip: no `c=' in SDP:  v=0^M o=root 2931 2931 IN IP4
192.168.0.4^M s=session^M c=IN IP4 192.168.0.4^M t=0 0^M m=audio 16768
RTP/AVP 8 0 3 10 97 18 2 5^M a=rtpmap:8 PCMA/8000^M a=rtpmap:0
PCMU/8000^M a=rtpmap:3 GSM/8000^M a=rtpmap:10 L16/8000^M a=rtpmap:97
iLBC/8000^M a=rtpmap:18 G729/8000^M a=rtpmap:2 G726-32/8000^M a=rtpmap:5
DVI4/8000^M a=silenceSupp:off - - - -^M  

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SipMessage:

SIP/2.0 183 Session Progress.
Via: SIP/2.0/UDP 192.168.0.185;branch=z9hG4bK3ead.91bc6532.0.
From: "Markus Monka" <sip:9090@>;tag=0000000000000000.
To: <sip:04321123456@>;tag=as2e40535e.
Call-ID: 0000000000000000@
CSeq: 22375 INVITE.
User-Agent: Asterisk PBX.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER.
Contact: <sip:04321123456@>.
Content-Type: application/sdp.
Content-Length: 331.
.
v=0.
o=root 2931 2931 IN IP4 192.168.0.4.
s=session.
c=IN IP4 192.168.0.4.
t=0 0.
m=audio 16768 RTP/AVP 8 0 3 10 97 18 2 5.
a=rtpmap:8 PCMA/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:3 GSM/8000.
a=rtpmap:10 L16/8000.
a=rtpmap:97 iLBC/8000.
a=rtpmap:18 G729/8000.
a=rtpmap:2 G726-32/8000.
a=rtpmap:5 DVI4/8000.
a=silenceSupp:off - - - -.

-------------------------------------------------------------------------------------------------------------------------------

Can someone explain me, why i got this error here?

        cp1 = NULL;
        for (cp = body->s; (len = body->s + body->len - cp) > 0;) {
                cp1 = ser_memmem(cp, "c=", len, 2);
                if (cp1 == NULL || cp1[-1] == '\n' || cp1[-1] == '\r')
                        break;
                cp = cp1 + 2;
        }
        if (cp1 == NULL) {
                LOG(L_DBG, "ERROR: extract_mediaip: no `c=' in SDP\n");
                return -1;
	}

Seems to me, that the "c=" Part is inside?

version: ser 0.8.14-4 (i386/linux)
flags: STATS:Off, USE_IPV6, USE_TCP, DISABLE_NAGLE, DNS_IP_HACK,
SHM_MEM, SHM_MMAP, PKG_MALLOC, F_MALLOC, FAST_LOCK-ADAPTIVE_WAIT
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16,
MAX_URI_SIZE 1024, BUF_SIZE 65535
@(#) $Id: main.c,v 1.168.4.3.2.1 2004/10/22 17:21:32 andrei Exp $
main.c compiled on 11:11:58 Feb 25 2005 with gcc 2.95

Thx
Markus