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  Encyclopedia of Keywords > Information > Qsig   Michael Charnine

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    This Review contains major "Qsig"- related terms, short phrases and links grouped together in the form of Encyclopedia article.


  1. QSIG is a variant of ISDN D-channel signaling.
  2. QSIG is the analogous signaling protocol used between private branch exchanges to support calls within private telephony networks. (Web site)
  3. QSIG is the internationally-standardized message-based signalling protocol for use in networks as described above.

Qsig Connect

  1. The QSIG CONNECT message is mapped to a SIP 200 OK response to the INVITE request.
  2. The SIP 2xx response to the INVITE request is mapped to a QSIG CONNECT message, signifying answer of the call.
  3. QSIG networking can be accomplished over IP networks using routers. (Web site)

Qsig Information

  1. However, NPI and TON fields in the QSIG information element concerned SHALL be set to appropriate values in accordance with [1].
  2. Otherwise, the gateway SHALL wait for more digits to arrive in QSIG INFORMATION messages.
  3. The translation of QSIG information elements into SIP headers can introduce some privacy and security concerns.


  1. QSIG provides a means for establishing and clearing calls that originate and terminate on different PINXs.
  2. NOTE 2: It is not necessarily appropriate to map some QSIG cause values to SIP messages because these cause values are meaningful only at the gateway.
  3. NOTE: [2] requires the QSIG timer to be stopped if the INFORMATION message contains a Sending complete information element or to be restarted otherwise.
  4. Expires - April 2005 [Page 1] Internet-Draft qsig2sip-transfer-01 October 2004 creating, modifying, and terminating sessions with one or more participants. (Web site)
  5. Another way of connecting two parts of a PISN would be to encapsulate QSIG signalling in SIP messages for calls between the two parts.


  1. The QSIG ALERTING message SHALL contain a Progress indicator information element containing progress description number 8. (Web site)
  2. CR1 and CR2 are QSIG call references. (Web site)
  3. In all other cases the receipt of a SIP 484 response SHALL NOT trigger the sending of any QSIG message. (Web site)
  4. Some additional risks may result from the mapping of SIP response codes to QSIG cause values. (Web site)
  5. On receipt of a SIP BYE request, the gateway SHALL send a QSIG DISCONNECT message with cause value 16 (normal call clearing).


  1. Only if the gateway cannot authorize itself should the gateway clear the call in the QSIG network with this cause value.
  2. On receipt of a SIP INVITE request relating to a call that has already been established from SIP to QSIG, the procedures of 8.3.9 SHALL apply.
  3. If the SIP 2xx response is received in response to the SIP PRACK request, the gateway SHALL NOT map this message to any QSIG message.
  4. NOTE: A QSIG DISCONNECT request will be sent when all outstanding SIP INVITE requests have received 4xx, 5xx, or 6xx responses.
  5. The gateway SHALL run QSIG protocol timers as specified in [2] and SHALL act in accordance with [2] if a QSIG protocol timer expires.

Between Sip

  1. There is a similar need to transport QSIG-encoded signaling information between SIP entities in some environments. (Web site)
  2. Best Current Practice [Page 39] RFC 4497 Interworking between SIP and QSIG May 2006 specific mappings are outside the scope of this specification.
  3. Best Current Practice [Page 41] RFC 4497 Interworking between SIP and QSIG May 2006 secure method to ascertain the identity of the caller).

Interworking Between

  1. Such calls are supported by gateways that perform interworking between SIP and QSIG. (Web site)
  2. This appendix shows some typical message sequences that can occur for an interworking between QSIG and SIP. It is informative. (Web site)
  3. Abstract This document specifies interworking between the Session Initiation Protocol (SIP) and QSIG within corporate networks. (Web site)

Qsig Message

  1. This is important for ensuring delivery of responses that map to essential QSIG messages.
  2. If the gateway receives further 200 (OK) responses, it SHALL respond to each in accordance with RFC 3261 and SHALL NOT generate any further QSIG messages. (Web site)
  3. The processing of any valid QSIG message that does not satisfy any of these conditions is outside the scope of this specification. (Web site)

Sip Xx

  1. In all other cases, the receipt of a SIP 4xx, 5xx, or 6xx final response to an INVITE request SHALL NOT trigger the sending of any QSIG message.
  2. The cause value in the QSIG DISCONNECT message SHALL be derived from the SIP 4xx-6xx response according to table 2. (Web site)


  1. QSIG is also independent of the transport protocol used to transport QSIG messages reliably over the signalling channel.
  2. QSIG is independent of the type of transmission capabilities over which the signalling channel and bearer channels are provided.
  3. NOTE: The name QSIG was derived from the fact that it is used for signalling at the Q reference point.

Ip Network

  1. An entity that performs interworking between a PISN using QSIG and an IP network using SIP. (Web site)
  2. Interworking between a PISN employing QSIG and a public IP network employing SIP is outside the scope of this specification. (Web site)


  1. The gateway SHOULD clear the call in the QSIG network with the indicated cause value only if retry is not possible or fails.
  2. Note that this may happen if two different gateways can be used to reach the QSIG side. (Web site)
  3. In that case, the gateway should use a QSIG indication that the number is not provided for interoperability reasons. (Web site)

Qsig Call Clearing

  1. NOTE 3: A QSIG call clearing message containing cause value 16 will normally result in the sending of a SIP BYE or CANCEL request. (Web site)
  2. If QSIG call clearing does, however, need to be initiated, the default cause value should be used.

Sip Invite Request

  1. The gateway SHALL generate SDP offer information to include in the SIP INVITE request based on information in the QSIG SETUP message. (Web site)
  2. When mapping a SIP INVITE request to a QSIG SETUP message, the gateway SHALL generate a Calling party number information element as follows. (Web site)

Qsig Disconnect

  1. The cause value in the QSIG DISCONNECT message Elwell, et al.
  2. Otherwise the gateway MAY send a QSIG DISCONNECT message. (Web site)
  3. If this occurs before T302 has expired, the gateway shall either send a QSIG DISCONNECT message (8.4.4) or behave as for a SIP 484 response ( (Web site)

Information Element

  1. In the latter case, a Cause information element is included in the QSIG PROGRESS message.
  2. The QSIG PROGRESS message SHALL contain progress description number 8 in a Progress indicator information element. (Web site)

Call Transfer

  1. QSIG Call transfer by rerouteing is out of scope of this document because of its lesser deployment. (Web site)
  2. The following notation is used for call transfer information within QSIG messages: - xxx.inv - invoke application protocol data unit (APDU) of operation xxx. (Web site)

Gateway Shall

  1. The gateway SHALL map a received QSIG PROGRESS message to a SIP 183 (Session Progress) response to the INVITE request.
  2. In all other scenarios the gateway SHALL NOT map the SIP 18x response to a QSIG message. (Web site)

Qsig Setup

  1. A call from QSIG to SIP is initiated when a QSIG SETUP message arrives at the gateway.
  2. When end users dial numbers in a PISN, their selections populate the Called party number information element in the QSIG SETUP message. (Web site)

Qsig Bodies

  1. Security considerations Information contained in ISUP and QSIG bodies may include sensitive customer information, potentially requiring use of encryption. (Web site)
  2. The "handling" parameter described above can also be used for QSIG bodies. (Web site)
  3. This document is specific to this usage and would not apply to the transportation of ISUP or QSIG messages in other applications. (Web site)
  4. The use of the 'version' parameter allows identification of different QSIG variants. (Web site)
  5. Q.931 and QSIG). 2) Provide a means to identify the particular SCN protocol being transported. (Web site)


  1. A new INVITE is sent with the same Call-ID but an updated Request-URI. 8 More digits are received from the PISN in a QSIG INFORMATION message. (Web site)
  2. The receipt of a SIP ACK request SHALL NOT result in any QSIG message being sent. (Web site)
  3. The receipt of a QSIG CALL PROCEEDING message SHALL NOT result in any SIP message being sent. (Web site)

Sip Dialog

  1. The resulting QSIG call is associated with the SIP INVITE request and with the eventual SIP dialog.
  2. NOTE: For all message sequence diagrams, there is no message mapping between QSIG and SIP unless explicitly indicated by dotted lines.
  3. The FACILITY message SHALL be sent with the QSIG call reference that maps to the SIP dialog of the REFER message. (Web site)

Qsig Sip

  1. The definition of Call Diversion Supplementary Service for QSIG to SIP interworking is beyond the scope of this specification.
  2. The gateway SHALL also disconnect media streams, if established, and allow QSIG and SIP signalling to complete in accordance with [2] and [10], respectively.
  3. How the QSIG and SIP fields that indicate identities are derived is described in section 8.2. (Web site)


  1. The new SIP environment needs to interwork with the QSIG-based PISN in order to support calls originating in one environment and terminating in the other.
  2. NOTE: This will ensure that QSIG timer T310 is stopped if running at the Originating PINX. (Web site)

Very Similar

  1. The QSIG Single step call transfer mechanism is very similar to the "basic transfer" described in [15].
  2. The QSIG Call transfer is also very similar to the "attended transfer" described in [15].
  3. Expires - April 2005 [Page 30] Internet-Draft qsig2sip-transfer-01 October 2004 and redirectionNumber of the QSIG invoke APDUs from the SIP header fields. (Web site)


  1. In addition to basic call capability, QSIG specifies a number of further capabilities supporting the use of supplementary services in PISNs.
  2. A PISN nodal entity comprising switching and call handling functions and supporting QSIG signalling in accordance with [2]. (Web site)


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  Originally created: March 13, 2007.
  Links checked: July 06, 2013.
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