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https://www.cisco.com/c/en/us/td/docs/routers/access/vg30d/vg30duser/vg30duser/vg30duserdpnss.html
Partial support. Features supported are limited to those features that are interworked between DPNSS and QSIG. DPNSS services such as NSI strings do not get passed if you are connecting DPNSS to DPNSS through Cisco Unified Communications Manager. 6 . Simple telephony call . Including OLI (Calling Party Number) 9 . Call back when free . Partial ...
https://www.cisco.com/c/en/us/products/unified-communications/vg30d-voice-gateway/index.html
The Cisco VG30D Voice Gateway also supports the mapping of advanced DPNSS supplementary services to and from QSIG. Works with Cisco Call-Processing Systems. The Cisco VG30D Voice Gateway operates with other Cisco Voice Gateways to connect Cisco Unified Communications Manager and Cisco Unified Communications Manager Business Edition to DPNSS ...
https://www.cisco.com/c/en/us/products/collateral/unified-communications/vg30d-voice-gateway/data_sheet_c78-538819.html
Sep 18, 2009 · The Cisco ® VG30D Voice Gateway is a time-division multiplexing (TDM) E1 converter. It supports the conversion of either the Q.931 (Primary Rate Interface [PRI]) or Q Signalling (QSIG) protocol to the United Kingdom (UK)-centric Digital Private Network Signalling System (DPNSS) protocol.
https://www.cisco.com/c/en/us/td/docs/routers/access/vg30d/vg30duser/vg30duser/vg30duserconver.html
DPNSS Networks in the UK typically support overlap signalling for all calls. You can make the Cisco VG30D Voice Gateway block up incoming digits from DPNSS by setting this option to None or I ncoming. In isolated cases, it may be appropriate to turn on preemptive call forwarding in the Q.931 stack. This action very rarely is required.
https://community.cisco.com/t5/other-collaboration-subjects/siemen-isdx-connected-to-router-using-dpnss-qsig-converter/td-p/40603
I have a customer who has a Siemens ISDX PABX with DPNSS modules available. We are proposing connecting a Call Manager system to the PABX using a cisco router with an E1 module running QSIG and a DPNSS-QSIG converter as the gateway The customer …
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