Hi,
we have a All-in-One solution for small customers, C881 router with Firewall, NAT, VPN and CCME (SIP phones) enabled. The box is registered to SIP provider (source-interface for control and media is the outside interface, otherwise, we can not register and place a call). Everything works fine for SIP softphones in the LAN. But when the user connects to the network via IPSec VPN, his softphone does not work. The phone rings, but that's all, it is dropped after 7 seconds. It is logical, because during call setup he is instructed to use router's outside IP address for call. And at this moment, the client starts to send packets outside of the IPSec tunnel directly to the internet address of the router.
Is there any way to make this work?
Something like using router outside address for registration to SIP provider and inside address for communication with SIP phones?
Or using sip profiles to modify the messages?
Thank you,
Lubomir
