Anonymous calling is permitted within Singapore.
- Sections 18.5 and 18.7 of the Singapore regulated interconnection agreements specify that CLI restriction is permitted.
Within Singapore it is available at the subscriber line level. This is done by request to your phone operator. In Singapore the market calls it Line Identification Restriction. Invariably this is operator based restriction and so Toku can conduct this for its customers as it must be enabled at the calling parties first switch layer. In other EU/US markets its done per call by the calling party utilising pre-digits.
SIP |
ISUP |
The technical framework for SIP uses the Privacy Asserted Identify (PAI) fields to pass on the actual CLI as per guideline of the ITU recommendations whilst “anonymous” can remain within the from field. |
For the technical framework for ISUP the below from the IDA (former name for IMDA) draws out the messaging header flows. https://studylib.net/doc/8382822/guide-for-calling-line-identity---infocomm-development-au... |
Retailers and Transit partners
Where an “anonymous” call exists each interconnect at the network signalling level needs to have a trusted status to transfer the PAI onward. The interconnect can obtain trusted level if they are licenced by the IMDA and therefore are also entrusted by regulations to adhere to CLIR.
The called party network, if they are trusted must not present the PAI but the anonymous. If the called party network is not trusted then the PAI must not be transferred to them and they should just accept “anonymous” as the CLI.
Trusted status assessment must include international interconnections. These providers can be assessed technically and must also sign a written agreement confirming they will adhere to the privacy of CLI restriction within the signalling of a call.
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