In the Cisco Unity Express 2.3 and Cisco CallManager Express 3.3, local phones can call voicemail and the auto attendant, but phones connected over the VPN receive no audio. They connect to voicemail, and the connected time increments, but there is no sound. These VPN phones can make calls to other phones. Also, IP Phones can be pinged from Cisco Unity Express.
If an ephone is attached to Cisco CallManager Express over IPsec, the ephone is able to transmit Real-Time Protocol (RTP) over the dialpeer. But, traffic that comes from the dialpeer to the ephone is not encrypted. As a result, the downstream router discards the clear rtp packets. This problem is most commonly seen if encrypted ephones and a Cisco Unity Express module are used together. The problem was found during testing of a teleworker solution.
There are two workarounds:
Use encrypted Generic Routing Encapsulation (GRE) tunnels. If the remote router is attached with a GRE/IPsec tunnel, the ephone routes through the tunnel and the GRE interface passes through encryption properly.
Use policy based routing (PBR) in order to force the ephone traffic through the encryptor. In order to do this, place a static route to the home ephone that points at a loopback interface. Then, use PBR on the loopback in order to set the next hop downstream of the crypto map. This is an example:
interface loopback 2 ip address x.x.x.x 255.255.255.0 !--- This is the Loopback Interface. ip policy route-map policymap exit
ip route x.x.x.x 0.0.0.0 loop 2 !--- This is the IP Phone Address.
route-map policymap permit 10 set ip next-hop y.y.y.y !--- This is the Next Hop - Public IP Address. exit
Hi Webexers ,
Just a question for feedback :How would everyone feel about a host having the capability to do a health check scan on not only their own network but for all the attendees also ? Would this help simplify life in overall in diagnosing w...
Dears I have a case in here. when I sent request to backend Host system to waiting for result , it takes a long time . May I add a script to prompt a music while customer wait for the result back from the Host ? when we get the r...
I have some deployments of 11.5.x, we are wanting to add more licenses but are confused on how to go about getting the the PAK. All of the part numbers we used in the past are no longer available for sale. can someone shed some light on how I would go abo...