Velosipedy and conversation of cloud telephones with each other
If the telecom operator respects itself, then it supports the SIP and the point. The process "subscriber A calls subscriber B" is easier to implement if the telephony /asterisk /freeswitch communicate in a uniform manner, according to the standard. For the sake of completeness, let's remember about the "iron" phones, which - a surprise - have not yet sunk into oblivion, because they are using the enterprise. However, working with this protocol is not the simplest thing that is in telephony. Today I'll tell you how our platform implements SIP and what nuances developers are waiting for; even if you are not a telecom developer, under the cut you will learn how platforms like cellular operators or our Voximplant interact.
And if you call a SIP-phone connected to another operator, a conditional Gigafon? For this, two telephones - Voximplant and Gigafon - must "make friends"
Peace, Friendship, SIP
The "friendship" between telephones usually consists in the fact that the Voximplant and Gigafon servers toggle the SIP signaling among themselves so that eventually the subscriber devices learn about each other. Such servers are called SIP Proxy (proxy). When the connection is established and the call is considered established, the subscriber units begin to exchange data (voice and /or video stream) over RTP. But first the Voximplant proxy should allow the Gigafone proxy to make an alarm.
The main way: trunk
- I have an army !
- And we have a trunk.
© The unnamed fantasy film
Trunk is an opportunity for other operators to call Voximplant subscriber devices. For Voximplant to give access to its devices, trunk uses whitelist IP addresses .
After adding the IP (or subnet) "Gigafon" to the whitelist, its SIP-devices will be able to reach ours without the registration procedure. Great and convenient, but what about the reverse trunk? Can other operators do trunk on Voximplant, that is, make us whitelisted?
If the operator knows how to trunk, then he can find out our address-password-addresses by making the request api.voximplant.com/getMediaResources?with_mediaservers . In response, JSON will come with the names and IP of the current media servers, which Gigafon will record at home.
But if the operator "Gigafon" does not know how to do trunk on other operators, that is, the auxiliary functionality:
The Voximplant control panel has a section SIP registration : this functionality allows us to register our platform as a SIP device in another telephony. Presenting huge cloud telephony in the form of one SIP phone is not the most correct solution, but it can be used as a "crutch" if other methods do not work.
SIP - the whole head
There is an opinion that SIP is a poorly standardized area of telecommunications, separate articles on Habr are devoted to this issue and holivars are not abating.
But still SIP has long become familiar and (with the right approach) a convenient "glue" for telecom operators, so trunk is a common functionality due to which flaps are connected on the telecommunications web. We wish you success in curbing SIP-settings; if there are any questions - comments are open.
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