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Networking
Remote SIP Phones
46
IPedge General Description 01/12
Remote SIP Phones
Benefits
SIP end points provide the ability to use application specific devices such as door phones, wireless
devices, paging systems, etc.
Requirements
In order to connect a remote SIP end point to an IP
edge
node, any of the following mechanisms
can be used:
•
SIP ALG (Application Layer Gateway)
•
A SIP ALG device needs to be configured at both the main office and at the remote location
to transform the SIP/SDP session header addressing information.
•
Firewall and NAT configurations to allow and forward SIP – UDP port 5060 to the IP
edge
system.
•
Media Relay Server (MRS)
– If a SIP ALG does not operate as desired, the MRS function
within IP
edge
can be used to get a remote SIP end point registered with an IP
edge
node. To use
this method, within the Firewall and the NAT router at the main office, the following ports need
to be opened and forwarded; in order for the remote SIP end point to communicate to the
IP
edge
system:
•
SIP – UDP port (5060)
•
Media Relay Server – UDP port range (21000 - 22999)
•
IPSec VPN
– A remote SIP end point can also connect to an IP
edge
node over an IPSec VPN
connection.
Interactions
When connecting SIP devices across routers, some home routers implement SIP application layer
gateways. To work successfully, these gateways need to be configured to enable SIP
transformation. However, not all application layer gateways work consistently and if a given
gateway does not work, it should be disabled and the IP
edge
Static MRS function can be invoked
to still support these end points.
Содержание ID EDGE
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