[SR-Users] SEMS with sbc application

[Stefan Sayer]

Hello,

Mojtaba wrote on 24.01.2018 12:17:
> Hello,
> I have a problem today, It's strange for me.
> Suppose we have this senario:
> uac1------->SEMS(mo profile)------->Kamailio-------->SEMS(mt
> profile)---------->uac2
> 
> In above topology, we have two interfaces(intern,extern) for SEMS, and
> just used as SBC (sbc application).
> if i used port=5060 as external port, every things is right and log
> file is like this:
>  [#7fed3f9f9700/32820] [run, udp_trsp.cpp:352] DEBUG: vv M [|] u recvd
> msg via UDP from 89.165.117.125:42411 vv
> --++--
> REGISTER sip:kava.shatel.ir;transport=UDP SIP/2.0
> Via: SIP/2.0/UDP
> 89.165.117.125:42411;branch=z9hG4bK-d8754z-021bd8b61efc7ac0-1---d8754z-
> Max-Forwards: 70
> Contact: <sip:4000@
> 89.165.117.125:42411;rinstance=79011092e56e1a09;transport=UDP>
> To: <sip:4000 at kava.shatel.ir;transport=UDP>
> From: <sip:4000 at kava.shatel.ir;transport=UDP>;tag=82820e1f
> Call-ID: Y2U4YThiYjEwNTUzMzliZTIwNWZkMDI3MTM4OTZlNWU.
> CSeq: 2 REGISTER
> Expires: 3600
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS,
> INFO, SUBSCRIBE
> Supported: replaces, norefersub, extended-refer, timer, X-cisco-serviceuri
> User-Agent: Z 3.3.25608 r25552
> Allow-Events: presence, kpml
> Content-Length: 0
> 
> but when i  changed port=4080 for external port, The Via header and
> contact header are changed to my public ip, like this:
> 
>  [#7fed3f9f9700/32820] [run, udp_trsp.cpp:352] DEBUG: vv M [|] u recvd
> msg via UDP from 89.165.117.125:42411 vv
> --++--
> REGISTER sip:kava.shatel.ir;transport=UDP SIP/2.0
> Via: SIP/2.0/UDP
> 172.1.1.125:42411;branch=z9hG4bK-d8754z-021bd8b61efc7ac0-1---d8754z-
> Max-Forwards: 70
> Contact: <sip:4000 at 172.1.1.125:42411;rinstance=79011092e56e1a09;transport=UDP>
> To: <sip:4000 at kava.shatel.ir;transport=UDP>
> From: <sip:4000 at kava.shatel.ir;transport=UDP>;tag=82820e1f
> Call-ID: Y2U4YThiYjEwNTUzMzliZTIwNWZkMDI3MTM4OTZlNWU.
> CSeq: 2 REGISTER
> Expires: 3600
> Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS,
> INFO, SUBSCRIBE
> Supported: replaces, norefersub, extended-refer, timer, X-cisco-serviceuri
> User-Agent: Z 3.3.25608 r25552
> Allow-Events: presence, kpml
> Content-Length: 0
> Why my public ip address is there here? I just changed external
> port=4080 in sems server. In SDP protocol i have the same problem when
> i changed external ip port in sems server.

is this message log the one of the first SEMS (mo profile) which is
sent by uac1? In that case it's the uac1 which puts the 172.1.1.125 IP
addresses in the SIP message. Or rather: I can imagine that there's a
SIP ALG on the NAT between the uac1 and SEMS, which only changes
packets when the destination port is 5060.

Stefan

> 
> Thanks.
> --Mojtaba Esfandiari.S
> 
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