[Serusers] c= wrong ?

[Iqbal]

Hi

The message below is from ser to the UA, now it seems as if the c= is 
wrong, because the UA is behind a NAT, and the c= should be of my 
mediaproxy (...correct ?), but it is actually of my pstn GW

1.2.3.4 = ser
x.x.x.x = client
a.b.c.d = pstn gw

Also why are there two c= lines

Iqbal


U 2005/09/08 15:35:37.529854 1.2.3.4:5060 -> x.x.x.x:5060

.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 3096 5788 IN IP4 a.b.c.d.
s=SIP Call.
c=IN IP4 a.b.c.d.
t=0 0.
m=audio 19570 RTP/AVP 0.
c=IN IP4 a.b.c.d.
a=rtpmap:0 PCMU/8000.