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Configuring Network Settings
4-30 41-001190-02 Rev. 01, Rel. 1.2
AastraLink Pro 160 Administrator Guide
• SIP Registration Expiration
Specifies the time, in seconds, that the SIP phone and AastraLink SIP trunks
use for their SIP registration renewal timer.
Usually no change is required for this parameter, but some SIP trunk service
providers may refuse registration if the period is set shorter than a specified
value, for example 3600 seconds. Default is 120.
•RTP Port Start
Specifies the public network first RTP port of the range on the router that the
AastraLink uses to communicate with IP phones for external SIP calls.
Default is 3000. This is the start of the range of UDP ports (from 'RTP Port
Start' to 'RTP Port Start + RTP Port Count' that must be forwarded to the
AastraLink from the public/external side of the Internet gateway/router for
SIP trunk and remote office calls to succeed. If UPnP is enabled, then port
forwarding is attempted automatically (see the RTP Port Range parameter).
• RTP Port Range
Specifies the RTP port range (offset from the RTP Port Start) used to support
the voice path for remote office IP phones and SIP trunk calls. Default is 300.
UPnP will attempt to allocate and forward the number of external ports
specified by RTP/RTCP Port Count. Forwarded ports lie within the range:
RTP Port Start through (RTP Port Start + RTP Port Range).
• RTP/RTCP Port Count
Specifies the total number of media stream ports the AastraLink can support
simultaneously for remote phone users.
Each incoming or outgoing call requires one media stream; each media stream
uses one RTP port and one RTCP port. To set this parameter, multiply the
maximum numbers of simultaneous calls supported on the AastraLink by two.
For example, the default setting of 20 allows the AastraLink to support 10
incoming or outgoing calls simultaneously.