[Koha] Why are there two SIP2 ports in Koha?

[Michael Kuhn]

Hi

When using the standard configuration in file "SIPconfig.xml" after 
enabling and starting the SIP2 servers there are two ports:

     <service
       port="8023/tcp"
       transport="telnet"
       protocol="SIP/2.00"
       timeout="60" />

     <service
       port="127.0.0.1:6001/tcp"
       transport="RAW"
       protocol="SIP/2.00"
       client_timeout="600"
       timeout="60" />

We have just reconfigured the following line

       port="10.0.0.1:6001/tcp"

and our 3M SelfCheck System Model 8420 can successfully connect and 
communicate via port 6001, without needing to add any sign in commands 
in expect syntax (which is needed when using port 8023 via telnet, as it 
is described in 
https://wiki.koha-community.org/wiki/Setting_up_Koha_SIP_and_3M_machines ).

Can someone please explain why there are two ports? Are these just 
offering the same functionality in two different ways (telnet, RAW), or 
is it maybe recommended to use telnet for some unknown security reasons?

Best wishes: Michael
-- 
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