Systems and methods for communication setup via reconciliation of internet protocol addresses
View Patent ↗Systems and methods for forwarding data packets to facilitate an IP telephony communication make use of a media relay to accomplish the forwarding actions. The media relay is configured receive setup signaling indicating a first acceptable originating IP address for received data packets. The media relay also allows the acceptable originating IP address to change once after the initial call setup has occurred. Also, if a REINVITE action occurs during a call, the media relay will allow the acceptable originating IP address to change once after the REINVITE signaling has been completed.
1. A method of maintaining a blacklist of unacceptable originating IP addresses at a media relay, comprising:
receiving a data packet at an idle port of a media relay;
adding the originating IP address of the received data packet to the blacklist;
receiving call setup signaling at the media relay after the data packet has been received and after the originating IP address of the data packet has been added to the blacklist, wherein the call setup signaling indicates that the media relay should expect to receive data packets bearing the media of an IP communication from the originating IP address of the received data packet; and
removing the originating IP address of the received data packet from the blacklist in response to receipt of the call setup signaling when the call setup signaling is received immediately after the originating IP address of the received data packet was added to the blacklist.
2. The method of claim 1 , wherein the blacklist of unacceptable originating IP addresses is specific to a particular port of the media relay.
3. A non-transitory computer readable medium having instructions stored thereon, which when executed by one or more processors of a media relay, cause the media relay to perform a method comprising:
receiving a data packet at an idle port of a media relay;
adding the originating IP address of the received data packet to the blacklist;
receiving call setup signaling at the media relay after the data packet has been received and after the originating IP address of the data packet has been added to the blacklist, wherein the call setup signaling indicates that the media relay should expect to receive data packets bearing the media of an IP communication from the originating IP address of the received data packet; and
removing the originating IP address of the received data packet from the blacklist in response to receipt of the call setup signaling when the call setup signaling is received immediately after the originating IP address of the received data packet was added to the blacklist.
4. The non-transitory computer readable medium of claim 3 , wherein the instructions cause the media relay to add and remove originating IP addresses to a blacklist of unacceptable IP addresses that is specific to a particular port of the media relay.
5. A system for maintaining a blacklist of unacceptable originating IP addresses at a media relay, comprising:
means for receiving a data packet at an idle port of a media relay;
means for adding the originating IP address of the received data packet to the blacklist;
means for receiving call setup signaling at the media relay after the data packet has been received and after the originating IP address of the data packet has been added to the blacklist, wherein the call setup signaling indicates that the media relay should expect to receive data packets bearing the media of an IP communication from the originating IP address of the received data packet; and
means for removing the originating IP address of the received data packet from the blacklist in response to receipt of the call setup signaling when the call setup signaling is received immediately after the originating IP address of the received data packet was added to the blacklist.
6. A system that is part of a media relay and for maintaining a blacklist of unacceptable originating IP addresses at the media relay, comprising:
a data packet handling unit that receives a data packet at an idle port of the media relay;
an addition unit that adds the originating IP address of the received data packet to the blacklist;
a communication setup unit that receives call setup signaling at the media relay after the data packet has been received and after the originating IP address of the received data packet has been added to the blacklist, wherein the call setup signaling indicates that the media relay should expect to receive data packets bearing the media of an IP communication from the originating IP address of the received data packet; and
a removal unit that removes the originating IP address of the received data packet from the blacklist in response to receipt of the call setup signaling when the call setup signaling is received immediately after the originating IP address of the received data packet is added to the blacklist.
7. The system of claim 6 , wherein the addition unit and the removal unit add and remove IP addresses from a blacklist of unacceptable IP addresses that is specific to a particular port of the media relay.
8. A method of processing data packets and maintaining a blacklist of unacceptable originating IP addresses at a media relay, comprising:
receiving call setup signaling at the media relay that authorizes a first port of the media relay to process and forward data packets that are received from a first acceptable originating IP address;
receiving a data packet at the first port of a media relay;
determining when an originating IP address of the received data packet is an acceptable originating IP address;
forwarding the received data packet when the originating IP address of the received data packet is an acceptable originating IP address;
checking, when the originating IP address of the received data packet is not an acceptable originating IP address, to determine if the acceptable IP address for the first port has changed since the call setup signaling was received;
resetting the acceptable originating IP address to a second acceptable originating IP address that is the originating IP address of the received data packet when the originating IP address of the received data packet is not an acceptable originating IP address and the acceptable originating IP address for the first port has not changed since the call setup signaling was received; and
adding the originating IP address of the received data packet to a blacklist of unacceptable originating IP addresses and discarding the received data packet if the originating IP address of the received data packet is not an acceptable originating IP address and the acceptable originating IP address for the first port has already changed since the call setup signaling was received.
9. The method of claim 8 , wherein the blacklist of unacceptable originating IP addresses is specific to the active port of the media relay.
10. A non-transitory computer readable medium having instructions stored thereon, which when executed by one or more processors of a media relay, cause the media relay to perform a method comprising:
receiving call setup signaling at the media relay that authorizes a first port of the media relay to process and forward data packets that are received from a first acceptable originating IP address;
receiving a data packet at the first port of a media relay;
determining when an originating IP address of the received data packet is an acceptable originating IP address;
forwarding the received data packet when the originating IP address of the received data packet is an acceptable originating IP address;
checking, when the originating IP address of the received data packet is not an acceptable originating IP address, to determine if the acceptable IP address for the first port has changed since the call setup signaling was received;
resetting the acceptable originating IP address to a second acceptable originating IP address that is the originating IP address of the received data packet when the originating IP address of the received data packet is not an acceptable originating IP address and the acceptable originating IP address for the first port has not changed since the call setup signaling was received; and
adding the originating IP address of the received data packet to a blacklist of unacceptable originating IP addresses and discarding the received data packet if the originating IP address of the received data packet is not an acceptable originating IP address and the acceptable originating IP address for the first port has already changed since the call setup signaling was received.
11. The non-transitory computer readable medium of claim 10 , wherein the instructions cause the media relay to add and remove originating IP addresses to a blacklist of unacceptable originating IP addresses that is specific to a particular port of the media relay.
12. A system that is part of a media relay and for maintaining a blacklist of unacceptable originating IP addresses at the media relay, comprising:
a communication setup unit that receives call setup signaling at the media relay that authorizes a first port of the media relay to process and forward data packets that are received from a first acceptable originating IP address;
a data packet handing unit that receives a data packet at the first port of a media relay, that determines when an originating IP address of the received data packet is an acceptable originating IP address, and that forwards the received data packet when the originating IP address of the received data packet is an acceptable originating IP address;
a blacklist maintenance unit that checks, when the originating IP address of the received data packet is not an acceptable originating IP address, to determine if the acceptable IP address for the first port has changed since the call setup signaling was received;
an IP address setting unit that resets the acceptable originating IP address to a second acceptable originating IP address that is the originating IP address of the received data packet when the originating IP address of the received data packet is not an acceptable originating IP address and the acceptable originating IP address for the first port has not changed since the call setup signaling was received;
wherein the blacklist maintenance unit adds the originating IP address of the received data packet to a blacklist of unacceptable originating IP addresses when the originating IP address of the received data packet is not an acceptable originating IP address and the acceptable originating IP address for the first port has already changed since the call setup signaling was received; and
wherein the data packet handing unit discards the received data packet when the originating IP address of the received data packet is not an acceptable originating IP address and the acceptable originating IP address for the first port has already changed since the call setup signaling was received.
13. The system of claim 12 , wherein the addition unit and the removal unit add and remove IP addresses from a blacklist of unacceptable IP addresses that is specific to a particular port of the media relay.