I am running into the following issue. I have a currently workin ASA5505, clients can get VPN and do what they need to do. We recently added an Allworx VoIP system that uses SIP.
The ports that are required are:
SIP TCP 5050
SIP UDP 5060
BLF UDP 2088
RTP UDP 15000-15511
Mgmt TCP 8080
We are having our clients get VPN into the network before they can use the softphone application (Xlite) on the network. When our clients get VPN, they can place a call, but are unable to hear audio in either direction.
I am attaching our configuration from the ASA.
Seems like you have configured your VoIP server to be NAT aware i.e. the server knows the public IP address it will be using when going to internet. So, it modifies the message headers accordingly when trying to reach subnets out of its own IP.You can see it from the capture:
Can you turn-off the NAT aware feature (typically it will be a field where you need to specify the public IP on the server) and see if that helps.