NEC SP5008A - Manual (Page 21)

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3. Web Administration
3.1 General configuration
3.1.1 SIP Advanced Setting
Local SIP port (1~65535) Specify the local SIP port’s number.
Local RTP port (1~65535) Specify the local RTP port’s number.
Session Expire (Sec) Specify the session expire time that will be used to
negotiate with the remote host or proxy.
Min Session Expire (Sec) Specify the minimum session expire time that other host
or proxy will need to follow when calling the MICRONET
SP5008A/SP5018A/SP5058A.
Session Refresh Request Select the session refresh method that will be used on
the MICRONET SP5008A/SP5018A/SP5058A, you can
choose among the two methods:
z UPDATE
z Re-Invite
Session Refresher Select who will perform the refreshes, you can choose
among the two methods:
z UAC (Client)
z UAS (Server)
This will add the parameter refresher=uac or uas in the