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Q21. What are the call features supported by SIP-ALG?
Ans: The call features supported by SIP-ALG are as below:
a. Registration
b. Call Establishment
c. Attended Call transfer
d. Unattended Call transfer
e. Call Forward
f. Voice Mail
g. Conference Call
Q22. I am using SIP-ALG for VoIP Calls between my branch offices. My VoIP Call
has been established, but I am unable to hear the voice of the other person. What
could be the problem?
Ans: This problem can occur if the SIP Phone has been registered to the Server with the
private IP Address/Port. Ensure that your phone's signaling port or the SIP Server
signaling port has been configured at the router via NAT → SIP-ALG.
Q23. I am not able to make calls after rebooting the router. Why?
Ans: After rebooting, the router cannot remember the device registrations which
happened earlier. You have to register your device again after the router reboots.
Q24. Can I use SIP-ALG for Video Over IP?
Ans: Yes. SIP-ALG can be used for both Voice and Video over IP. The only requirement
is that the voice/video endpoints or equipment use SIP (Session Initiation Protocol) for
Call Establishment and RTP (Real-time Transport Protocol) for Voice/Video traffic.
Q25. Can I use TCP for SIP signaling or media traffic in DRO2xx router?
Ans: DRO2XX routers support only UDP for both signaling and media traffic.
11.7 VPN
Q26. I want to use IPSec VPN for Secure Branch Office access. Will this make my
access very slow?
Ans: The router has a built-in hardware accelerator to guarantee high-speed encryption
and decryption for secure VPN Connectivity. The speed of your access is more dependant
on the speed of your ISP Connectivity.
Q27. Will the router's VPN feature offer virus protection?
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