Hello, we have a SIP gateway and need to find a way to prevent "untrusted" phones from sending SIP messages to gain unauthorized access to make calls over the PSTN.
It is not possible to implement an access-list to reject SIP messages from the subnets where phones may reside (thereby accepting signalling only from the CallManagers), as this gateway is also providing SRST services.
Is there any way that security can be enforced in this scenario?
The Cisco Multiservice IP-to-IP Gateway available on Cisco IOS voice gateways provides a toolkit of session border controller functions. These include signal interworking between SIP and H.323, security with firewall and denial of service protection, topology hiding with address and port translations, billing and call detail record normalization, QoS and bandwidth management.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...