Hello,

every SIP UA that sends out a request must add a Via header with own address, not matter is the originating UA, intermediary SBC or proxy. The SBC/B2BUA, remove incoming Via headers, but they add one with onw address, otherwise routing of replies does not work.

Anyhow, if you need topology hiding for calls, look at topos or topoh modules in Kamailio.

Cheers,
Daniel

Hello there,

According to ,https://lists.kamailio.org/pipermail/sr-users/2016-March/092058.html, which talked about  B2BUA (just signalling) in Kamailio.

As i have experienced working with SEMS, freeswitch and Kamailio while using B2BUA feature, Each of them have pros and cons:

1- The sems is a light sip engine server with several applications (like as sbc) for using b2bua. All incoming and outgoing calls could go to sems server for doing b2bua like this:

Incoming<=======>Kamailio<========>Sems<========>Kamailio<=======>outgoing

2- In sems, you could disable rtp realying. It forces sems to work just as b2bua without anchoring RTP

3- Easy to use different active profiles in routing.

Just a couple of things there are in SEMS.  For example, the sems adds itself (local IP) in Via header, and it couldn't be common in b2bua. like this:

.

.

.

INVITE sip:200@cloud.domain.com;transport=UDP SIP/2.0
Via: SIP/2.0/UDP 10.10.10.200;branch=z9hG4bK2f53.07a3fd9edaa8c8d609ab2ac6b01a087f.0 ================================>Kamailio public IP
Via: SIP/2.0/UDP 127.0.0.1:5080;received=127.0.0.1;branch=z9hG4bKsPRMNast;rport=5080 ===============================>private loopback sems ip
From: <sip:100@cloud.domain.com;transport=UDP>;tag=6FFDB493-60EABB3600016ECD-379F9700
To: <sip:200@cloud.domain.com;transport=UDP>
CSeq: 10 INVITE
Call-ID: Y2M1ODQxNTZmMjdkZWZjN2U5MmMyYjBmN2Y2OGY1ODQ._leg2
Route: <sip:mo@127.0.0.1:5060;lr>
Max-Forwards: 69
Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, INFO, SUBSCRIBE
User-Agent: Z 3.3.25608 r25552
Content-Type: application/sdp
Contact: <sip:127.0.0.1:5080;transport=udp>
Content-Length: 246

.

.

.

For this reason, Is there a way to avoid this issue? I know it is possible to do this by using other modules like textops and retransformation ?

And why in Kamailio, there is no b2bua module to perform all b2bua functionality, yet?

Thanks with Best Regards.

--

--Mojtaba Esfandiari.S

__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions
  * sr-users@lists.kamailio.org
Important: keep the mailing list in the recipients, do not reply only to the sender!
Edit mailing list options or unsubscribe:
  * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users

-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda