[Freeswitch-users] Howto? Migrating from Siemens HiPath4000 to FreeSWITCH

João Mesquita jmesquita at freeswitch.org
Thu May 10 18:16:23 MSD 2012


I work with a Brazilian company called Khomp. They have been replacing Dialogic cards on their traditional market for many years now and Dialogic barely exists in Brazil because of them. A few years ago, they've ported their product line to work with Asterisk and now they also support FreeSWITCH. The main advantage of this product (as well as Dialogic) is that all protocols are implemented on the hardware and therefore if something does not work on the protocol level, it will be fixed by the factory.

Khomp in Brazil is known by their fast response technical support (you can't expect to have Dialogic traditional developers if you don't whereas the FreeSWITCH/Asterisk market is more tolerant).

The other side effect and something that you are most certainly not considering is that you will need something more advanced then just PRI emulated as carrier (sending clock) to your Siemens. To depict that, let's imagine a scenario.

Alice calls Bob from a Siemens based phone to a FreeSWITCH extension (at this instance, you have 1 channel occupied on the PRI). Bob decides that this calls is to Robert, who uses a Siemens phone and transfers that call. At this point, you will be using 2 channels of the PRI and if this scenario is common, you'll end up with a channel shortage for the other PSTN calls and such. The way to solve this, is to use a modified ISDN version supported by the Siemens called QSIG. QSIG allows you to execute a certain transfer and free the channels, leaving the call handled by the Siemens alone since FS has nothing to do with it anymore.

Khomp does support this protocol and it is widely tested with Siemens since we do sell a lot of cards to Siemens system integrators around the world for their dialers, ivrs and whatnot. If you are interested, let me know. I don't know if Sangoma has a solution for that and I am not trying to make you buy us instead of them, but I would like to warn you of that as well.  

For those who like the external device, Khomp has a new "TDMoE" like interface that is called EBS (External Board Series). Since TDMoE does not scale well, they have implemented their own protocol of control called CTIoIP. It is quite interesting and it scales REALLY well with FreeSWITCH (I have personally tried).

Just my 2 cents.


João Mesquita
Sent with Sparrow (http://www.sparrowmailapp.com/?sig)

On Thursday, May 10, 2012 at 7:53 AM, Markus Lindenberg wrote:

> Hi Patrick,
> On Thu, May 10, 2012 at 12:33 PM, Patrick Lists
> <freeswitch-list at puzzled.xs4all.nl (mailto:freeswitch-list at puzzled.xs4all.nl)> wrote:
> >  
> > I agree that the Dialogic Diva cards are great. I've been using them for
> > many years and they have always worked flawlessly. Like the Sangoma
> > cards I might add. Afaik there is no channel driver for Diva cards in
> > FreeSWITCH (Dialogic: create one!) so in relation to FreeSWITCH it would
> > unfortunately not be an option. There is chan_capi in the Asterisk world
> > which works great.
> >  
> There is one option: Diva SIPcontrol turns the Diva cards into a
> Mediagateway with SIP-Interface. Works great and is easy to set up.
> Afaik a two channel license suitable for a single BRI can be used free
> of charge.
> http://www.dialogic.com/Products/gateways/enterprise-media-gateways/sipcontrol.aspx
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