Thank you, snom ONE, for quick response.
One important point. Client has 8 E1 trunks. Thus 240 channels make huge traffic and I do not know how to process it by multiple PBXs.
Could someone post any schema or diagram how to make it.
I read a lof of articles that I certainly have to use Sip Proxy for this but I did not find any articles how to setup sip proxy with pbxnsip (snomone).
Thank you in advance.