This problems relates to unattended REFER transfers in an IMS network. Background: 3GPP IMS does not mandate a NOTIFY to be sent for the implicit Subscription created by the REFER. But the UAC, sending the REFER, will create a Subscription before sending the REFER out. The subscription created by REFER will end under the following situations. - a response to the REFER is not received - A NOTIFY is received with the "Subscriptionn-State" header set to "terminated" - A NOTIFY contains a Expires timer, which will trigger the expiration of the subscription in the UAC. Problem: Since IMS implementations do not send a NOTIFY, the subscription created by the REFER request will hang around indefinately. Are there any known solutions to deal with the non-receipt of NOTIFY messsages to end the subscription in the UAC that sent the REFER. Thanks, Nagesh Shekar
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