Digital Private Network Signalling System: Difference between revisions

Revision as of 23:48, 18 March 2012

Revision as of 13:37, 30 May 2012

Line 21:

==DPNSS and VoIP==

For a protocol that began life in the 1980s, DPNSS is natively a long way from VoIP. However, many of the hybrid VoIP PBXs available from manufacturers worldwide provide on-board DPNSS trunk cards. Where they do not, a protocol converter is necessary. Commercially available equipment offers the ability to convert from DPNSS to Q.Sig. Note that it is also possible to tunnel DPNSS and its associated PCM (G711) over an IP network. This can be point to point where the IP network carries packetised voice N x 64 Kbs speech and a separate IP signalling channel to carry the notional 64 Kbs of DPNSS signalling. A more sophisticated solution uses intelligence on the edge of the IP network to route voice to the correct node. This is a [http://en.wikipedia.org/wiki/Voice_VPN[VoIPVoice (voice)VPN]]].

Note that this should not be confused with the pre-VOIP 'Voice VPN' deployed by routing calls intelligently in a TDM switching platform, often Nortel DMS100 and customers PBX nodes.

Line 28:

==See also==

* [[DASS1|Digital Access Signaling System 1 (DASS1)]] (obsolete)

* [[DASS2|Digital Access Signaling System 2 (DASS2)]] (obsolete)

* [[QSIG]] (the [[International Standards Organisation|ISO]] equivalent of DPNSS, uses the [[Q.931]] and [[Remote Operations Service Element protocol|ROSE]] protocols. It is widely used in the rest of Europe).

* [[DSS1|Digital Subscriber System No. 1 (DSS1)]] The ISDN PBX interface is most often used for (new) PRA connected PBX

* [[Session Initiation Protocol|Session Initiation Protocol (SIP)]] SIP is most often used for IP connected PBX