[SR-Users] which is better for B2BUA

[Daniel-Constantin Mierla]

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

On 13.07.21 10:08, Mojtaba wrote:
>
> Hello there,
> According to
> ,https://lists.kamailio.org/pipermail/sr-users/2016-March/092058.html
> <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 at cloud.domain.com
> <mailto:sip%3A200 at 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 at cloud.domain.com
> <mailto:sip%3A100 at cloud.domain.com>;transport=UDP>;tag=6FFDB493-60EABB3600016ECD-379F9700
> To: <sip:200 at cloud.domain.com
> <mailto:sip%3A200 at cloud.domain.com>;transport=UDP>
> CSeq: 10 INVITE
> Call-ID: Y2M1ODQxNTZmMjdkZWZjN2U5MmMyYjBmN2Y2OGY1ODQ._leg2
> Route: <sip:mo at 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
>
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-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda

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