Hi all I am trying to establish communication between the Elastix sip extensions and extensions of Panasonic TDA 100, however we have not, here are details of the scenario Ok, the Persian paransonic Panasonic says that it has to be a extension, the panasonic has 4 channels available on the card virtual, we did the following: 1 - 4 extensions configured elastix 2 - In the panasonic the configure each of these extensions in respective channels. Objective That both Panasonic and Elastix PBX can be seen and that Hagn calls between them in a transparent manner, the design is as follows: Extensions 100 to 200 are in Panasonic The extensions 300 and 399 are in elastix and are SIP It means that any extension of the Panasonic (100-200) call Elastix extensions (300-399) and vice versa, this is comunciacion trasnparente quienre do so. In an Alcatel so we did and what was set up a SIP Trunk on Elastix and people Aclaltel configure your SIP and everything is OK, but this Panasonic is traumatic and there is a poor basis for knowledge with the Panasonic. Work Done: [/ b] were created four extensions, set up four SIP SIP trunk each name is the name of the extension, the people of Panasonic Panasonic configure each channel extension that took place in the Elastix , as Panasonic says it works only in this way, as extensions of elastix without however not bind channels. the SIP ocnfiguracion I have is: Trunk Name: 300 (this name is the extension that previously believed in the extension module) PEER Details context = from-pstn host = 172.16.16.40 secret = 123456 insecure = very qualify = yes type = friend disallow = all allow = ulaw & alaw USER Detail host = 172.16.16.40 If they can drme a suggestion they are greatly appreciated.