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Reply To: PLMN not allowed : conditions ?

#69926
Wallis Dudhnath
Guest

As a part of Roaming a raft of parameters are sent from the HPLMN (HLR) to the VPLMN (VLR). This assumes that a Roaming agreement is in place with the co-operating CSPs (operators). GSM MAP V3 or above is the key protocol that is used to convey InsertSubscriberData() to the VPLMN.

Below are some parameters that are conveyed:-

-MSISDN. The ISDN number assigned to the roamer.

-IMSI. The IMSI of the roamer.

-Category. This refers to the calling party category. It is included either at location updating or when it is changed.

-Subscriber status. This parameter is set to service granted if no operator-determined barring (ODB) is required. To apply, remove, or update ODB, the subscriber status is set to operator-determined barring. In this case, the ODB parameter is present.

-Forwarding information list. This includes the SS code for an individual call forwarding supplementary service.

-Call barring information list. This includes the SS code for an individual call barring supplementary service.

-Bearer service list. This lists the codes of all bearer services subscribed to by the roamer.

-Teleservice list. This lists the codes of all the teleservices subscribed to by the roamer.

-Operator-determined barring HPLMN data. This includes all the operator-determined barring categories that may be applied to a roamer in a VPLMN.

Recommend that you look at 3GPP’s MAP Specification.

Error codes exists that will help you to understand the nature of the failure. Below are some examples:-

-Unknown subscriber. No such subscriber.

-Roaming not allowed. The diagnostic code provides further information.

-PLMN not allowed

-Operator-determined barring