Cortelco C56P User Manual download pdf (Page 28)

Click to Talk Set click to Talk (need practical software support).

Enable BLF List Enable BLF List by selecting it, BLF list is a function which can

monitor the group status, it is not one to one monitoring, but the

information feedback from the sever to decide which

BLF list will monitor

BLF List Number Specify the BLF List Number

Strict Branch Enable the Strict Branch, the value of the branch must be in the

beginning of z9hG4k in via field of the invite sip message

received, or the phone won’t response to the invite sip message.

Notice: the deployment will become effective in all sip lines

Enable Group Enable Group by selecting it, then the phone enable the sip group

backup function

Notice: the deployment will become effective in all sip lines

Registration Failure Retry

Time

Specify the registration failure retry time, if the phone register

failed, the phone will register again after registration failure

retry time.

Notice: the deployment will become effective in all sip lines.

4.3.3.2. Stun Config

In this web page, you can config SIP STUN.

STUN:

By STUN server, the phone in private network could know the type of NAT and the NAT mapping IP

and port of SIP. The phone might register itself to SIP server with global IP and port to realize the device

both calling and being called in private

network.

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Cortelco C56P User Manual Page 28