Hi,
I have a simple application for outgoing calls, using pjsip 2.0.1 and
its python bindings. The application should run on a multi-home host
with multiple IP addresses (some internal, one external) and use the
external IP address. I create my Transport with a TransportConfig and
the external IP address like that:
transport = lib.create_transport(pj.TransportType.UDP,
pj.TransportConfig(bound_addr=ext_ip, public_addr=ext_ip))
The Problem now is that the media keeps using the internal address in
the SDP's connection information and as the source address for the RTP
packets.
I tried several combinations of bound_addr and public_addr, but that did
not change anything. A strace reveals that the SIP socket is actually
bind() to the ext-ip, but the RTP (and RTCP) socket to INADDR_ANY (0.0.0.0):
> 9613 socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 5
> 9613 bind(5, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("212.xxx.xx.xxx")}, 16) = 0
...
> 9613 socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 7
> 9613 bind(7, {sa_family=AF_INET, sin_port=htons(40000), sin_addr=inet_addr("0.0.0.0")}, 16) = 0
> 9613 socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 8
> 9613 bind(8, {sa_family=AF_INET, sin_port=htons(40001), sin_addr=inet_addr("0.0.0.0")}, 16) = 0
I found a posting to the list
(http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/2011-June/012978.html)
with the same problem, but with no answer. Is there really no way to get
this right out of the box? I'm trying to go through the sources, but the
complexity is a little mind-boggling...
TIA & Regards
Jakob
