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QSIG Supplimentary Services Overview
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QSIG Supplimentary Services Overview

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The following QSIG supplementary service features are supported in Cisco Unified CME systems. They follow the standards from the European Computer Manufacturers Association (ECMA) and the International Organization for Standardization (ISO) on PRI and BRI interfaces.

  • Basic calls between IP phones and PBX phones.
  • Calling Line/Name Identification (CLIP/CNIP) presented on an IP phone when called by a PBX phone; in the reverse direction, such information is provided to the called endpoint.
  • Connected Line/Name Identification (COLP/CONP) information provided when a PBX phone calls an IP phone and is connected; in the reverse direction, such information presented on an IP phone.
  • Call Forward using QSIG and H.450.3 to support any combination of IP phone and PBX phone, including an IP phone in the Cisco Unified CME system that is connected to a PBX or an IP phone in another Cisco Unified CME system across an H.323 network.
  • Call forward to the PBX message center according to the configured policy. The other two endpoints can be a mixture of IP phone and PBX phones.
  • Hairpin call transfer, which interworks with a PBX in transfer-by-join mode. Note that Cisco Unified CME does not support the actual signaling specified for this transfer mode (including the involved FACILITY message service APDUs) which are intended for an informative purpose only and not for the transfer functionality itself. As a transferrer (XOR) host, Cisco Unified CME simply hairpins two call legs to create a connection; as a transferee (XEE) or transfer-to (XTO) host, it will not be aware of a transfer that is taking place on an existing leg. As a     result, the final endpoint may not be updated with the accurate identity of its peer. Both blind transfer and consult transfer are supported.
  • Message-waiting indicator (MWI) activation or deactivation requests are processed from the PBX message center.
  • The PBX message center can be interrogated for the MWI status of a particular ephone-dn.
  • A user can retrieve voice messages from a PBX message center by making a normal call to the message center access number.

The following example implements QSIG supplementary services on extension 74367 and globally enables H.450.7 supplementary services and QSIG call-forwarding supplementary services.

voicemail 74398
transfer-system full-consult
ephone-dn 25
number 74367
mwi qsig
call-forward all 74000
voice service voip
supplementary-service h450.7
voice service pots
supplementary-service qsig call-forward