As far as I know and based from previuos deployment with cucm, your VG30D connects to your voice gateway using QSIG (i used mgcp as my gateway protocol). In a previous deployment, I configured my gateway as mgcp with qsig on cucm. This gateway then connects to the qsig port on the VG30D. While the DPNSS port connects to the DPNSS network (in your case the siemens..
Here is a sample picture of the VG30D
The VG30D is a 2 port device. Each port may be configured for 75 0hm unbalanced or 120 Ohm balanced operation.
Port 1 is to be configured for Q.SIG operation and Port 2 for DPNSS operation.
The DPNSS Port can be configured for 120 ohm Balanced operation or 75 0hm unbalanced. The DPNSS port can also be configured as “B” end with Channel Priority X. or A end with channel priority Y. You will nee to talk to the siemens guys to know what the setup is and then configure the VG30D accordingly.
If the Siemens DPNSS interface is Rj45 connectors then you will need an E1 Crossover cable to connect to it. A straight through E1 Cable will be required to connect the VG30D to the Voice Gateway.
If the siemens inteface is 75 0hm unbalanced,you will need RF Coaxial cable using BNC connectors to connect to it.
It is advisable that The Q.SIG Port (Port 1) should be configured as the Q.SIG Network side. This port will provide Link Synchronisation to the Voice Gateway E1 Interface. It is also advisabel that Clocking is derived from the 2nd port (DPNSS) of the VG30Ds
This hsould help you plan your deployment carefully.
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