Removing the plus sign on incoming PSTN calls

When calls come in to Lync from the PSTN, Lync normalizes the called phone number by applying the normalization rules from the global dial plan. However, if the number starts with a plus sign (+) when it arrives from the gateway, Lync assumes it is already correctly normalized in E.164 format and skips the normalization step. This means that there’s no way to apply further rules to the called number when it is already formatted with a plus sign by the gateway.

As it often does, the Lync Server SDK comes to the rescue here with a slightly complicated but functional way to remove that plus sign and get Lync to apply the normalization rules to those calls. Continue reading “Removing the plus sign on incoming PSTN calls” »