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They do share this info through the ITU.<br />
<br />
Not something that is publicly available.<br />
Anyway it's the job of net MNO to get acquainted to the neighbours. and possibly negotiate peering contract with them.<br />
<br />
For VOIP there are possiblities created a a long time ago (E.164 throug DNS &nbsp; ie. full numbers (incl. country code, without prefixes) reversed suffixed with e164.arpa that provide NAPTR records (ENUM standard) with prefered contact methods.<br />
<a href="https://en.wikipedia.org/wiki/E.164" rel="ugc">https://en.wikipedia.org/wiki/E.164</a>&nbsp;can provide more reading &amp;&nbsp;pointers.
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They do share this info through the ITU.

Not something that is publicly available.
Anyway it's the job of net MNO to get acquainted to the neighbours. and possibly negotiate peering contract with them.

For VOIP there are possiblities created a a long time ago (E.164 throug DNS   ie. full numbers (incl. country code, without prefixes) reversed suffixed with e164.arpa that provide NAPTR records (ENUM standard) with prefered contact methods.
https://en.wikipedia.org/wiki/E.164 [https://en.wikipedia.org/wiki/E.164] can provide more reading & pointers.

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I'm trying to understand internals of mobile networks (GSM, 3GPP) and routing calls between them.<br />
<br />
When new Mobile Network Operator (MNO) starts its operation, how does other mobile (and fixed) networks all over the world know, how should they route calls to this new network? <br />
<br />
Where can I find more information about this topic?
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I'm trying to understand internals of mobile networks (GSM, 3GPP) and routing calls between them.

When new Mobile Network Operator (MNO) starts its operation, how does other mobile (and fixed) networks all over the world know, how should they route calls to this new network? 

Where can I find more information about this topic?

Routing calls to new mobile network

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Mobile

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.