08-Sep-2016 12:36

IAX Type Connection of Two Servers


Connecting two servers using IAX type is a convenient way for the termination, allowing you to place the equipment in different cities.

However, construction of build VoIP server cannot be practically carried out by anyone without problems. When calling, an error is usually indicated in the message of the type: chan_iax2.c: 14202 iax2_exists: Unable to make DP cache or Accepted AUTHENTICATED TBD call from 10.10 * *:.. 4569.

It can be fixed if the action of dynamic or static host addressing and NAT, including the establishment of the right text scheme are correctly specified. One of the reasons for such errors is an improper specification of network data kernel when you have multiple IP-addresses. When you configure IAX2, bindaddress or is usually indicated. Hosts may be random, according to the Asterisk 1 scheme ( and Asterisk 2 (

Two servers using IAX type are connected in several ways. The most popular of them is an indication of IAX according to the host with the local context and the group, sending it to the server and specification of appropriate data. Calling is usually in mycontext to extend from 5000 to 5999, according to _5XXX for the server. The option is convenient because links are placed in a server file. However, data on dialing appear in the log, and the string gets longer. And registration files.Dial log may be missing.

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When connecting, it is important to correctly specify names of the devices. In brackets, you can specify any name, and numbering should be strict. Afterwards, you should indicate the names of the IP-addresses of the first and second asterisk. Further, you should properly specify the names of servers, usernames, and passwords.

The appropriate trunks should be allocated to each of them. For Asterisk server, you need to coordinate direct dial through the prefix in both directions, according to the IAX2. In the external DNS names you should specify both Asterisks with multiple providers. At the same time, direct access to the Internet does not matter. UDP specification is important for port 4569. The data must reach the IAX2.

The construction via login, password, specification of email address and account are used for calls. Calls are made to the server after login. Registration is checked against a set of iax2 show registry data.

The IP is the address used the provider in the NAT. For example, is for one provider and as another one. The gateway specifies the IP-addresses for the ISP.

As a result of the above actions, the two servers should be connected to each other and respond to the signals, transmit data, make incoming/outgoing calls, and by means of which successful VoIP termination will be carried out.

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