Yeah. I can see the reason.
But this is only an assumption that might fail very possibly.
2008/11/12 Gang Liu <gangban.lau at gmail.com>:
> Hi,
> I have tested the same env, also found this behiver. After I enabled
> record-route at proxy(OpenSer), it works well.
> I guess it is for NAT friendly, let proxy reuse the old connected tcp
> connection.Otherwise call setup will fail if callee is behind NAT and caller
> try to reach callee 5060 port.
>
> regards,
> Gang
>
> 2008/11/12 Peter Cai <newptcai at gmail.com>
>>
>> Tried with pjsua_vc8d.exe, the demo provided in "pjsua" project, the
>> same problem found.
>>
>> On Wed, Nov 12, 2008 at 6:03 PM, Peter Cai <newptcai at gmail.com> wrote:
>> > Hi all,
>> >
>> > I'm testing PJSIP with TCP transport, with windows mesenger.
>> >
>> > The environment is like this
>> >
>> >
>> > PJ <-----TCP-----> PROXY <---------TCP-----------> Windows Messenger.
>> > (WM)
>> >
>> > I used the example "simple_pjsua.c" from PJ's web site:
>> >
>> >
>> > file:///E:/Software/Sites/pjsip_pjsip_docs_html/www.pjsip.org/pjsip/docs/html/page_pjsip_sample_simple_pjsuaua_c.htm
>> >
>> >
>> > Modified 2 lines to use TCP.
>> >
>> > << status = pjsua_transport_create(PJSIP_TRANSPORT_UDP, &cfg, NULL);
>> >
>> >>> status = pjsua_transport_create(PJSIP_TRANSPORT_TCP, &cfg, NULL);
>> >
>> > << cfg.reg_uri = pj_str("sip:" SIP_DOMAIN ";transport=tcp");
>> >
>> >>> cfg.reg_uri = pj_str("sip:" SIP_DOMAIN ";transport=tcp");
>> >
>> >
>> > According to the packages I captured, the process is:
>> >
>> > 1. PJ register with port 5060
>> > 2. PJ changed to register with a random selected port, 39122 e.g.,
>> > and un-register port 5060
>> > 3. PJ answer INVITE with 200 OK, with port 39122 in CONTACT header.
>> > 4. WM tries to connect to port 39122, but failed. So ACK could not be
>> > sent!
>> >
>> > PJ is not listening on 39122, but wrongly using it in CONTACT header of
>> > 200 OK.
>> >
>> > If further information needed. I can provide captured packages.
>> >
>>
>>
>>
>> --
>>
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>
>
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