[Serusers] trying to USE SER for a contact centre application

All, just started using SER (great experience so far!). I'm trying to us it for a contact centre application where I have a specific requirement that calls can only be terminated in one direction, from a Cisco AS53xx gateway, not a Cisco phone. Here's the set-up and desired result: User logs into the contact centre systems which initiates a call on the PSTN side of the AS53xx. This then creates a VOIP (SIP) call leg from a dial-peer on the gateway, via the SER proxy. The agents all have Cisco 7960 IP phones which register with the SER registrar. The INVITE is proxied via a simple location lookup in the SER route[0] config file to the appropriate handset. The agent answers the call and is "logged" in to the system. Now's the fun part. I want to prevent the SIP leg being torn-down by the agent either accidentally or on purpose hanging up the call from the handset. Here's the logic (pseudo code) I have though out: Trap the BYE from the handset using a statement something like: if (method=="BYE" and uri=~"sip:[0-9]+@*") { # Agent phone initiated the BYE so do something route(1); } else { #do something else - pass on the message I guess }; route[1] { # use exec to call an external function exec_msg ('script.file'); } The external script needs to OK the BYE message - I assume use the FIFO function to construct the OK message. Now the tricky part: how do I stop the called phone from hanging up, (I tried a simple 403 Forbidden response) but that didn't work. So I thought about the REFER method with the URL of the phone sending the BYE message- can I send a refer to the Gateway (AS5300) that still thinks the dialogue is open to the phone and "hopefully" get it to send a new INVITE dialogue to the phone? Or would I have to generate a new INVITE sequence from the SER proxy exec code? If its the latter, then I need access to the RTP port number on the AS53xx from the original INVITE message - and this implies access to the SDP payload - which I can't see from the SER script (unless anyone can tell me how?) Thanks in advance!!! Neill....:o) Neill Wilkinson Senior Consultant Quortex Consultants Ltd. e: neill.wilkinson(a)quortex.com