[SR-Users] Sipwise SEMS

[Mojtaba]

Hello there,
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;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
;transport=UDP>;tag=6FFDB493-60EABB3600016ECD-379F9700
To: <sip:200 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?
Also, Why in Kamailio, there is not b2bua module so that perform all b2bua
functionality? i know it is possible to do this by using other modules like
textops and retransformation ?
Thanks with Best Regards.
Mojtaba

On Thu, Jul 8, 2021 at 5:49 PM Dmitry Sinina <dmitry.sinina at onat.edu.ua>
wrote:

> I mean there are no commits to this modules for years(excluding may be
> some cosmetic fixes) when yeti-switch sems core was changed a lot.
>
> On 08.07.21 15:59, Juha Heinanen wrote:
> > Dmitry Sinina writes:
> >
> >> Currently https://github.com/yeti-switch/sems supports zrtp as well as
> >> srtp-dtls and srtp-sdes. But you are right, old applications like sbc
> >> and dsm requires modifications to run.
> > What do you mean by "old"?  sbc and dsm apps are much younger that many
> > others.
> >
> > -- Juha
> >
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-- 
--Mojtaba Esfandiari.S
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