This setting works fine.
Many thanks for your quick and accurate answer!

1. Brekeke Product Name and Version: Brekeke SIP Server , Version 2.4.8.6/286.3 2. Java version: 1.6.0_43 3. OS type and the version: Windows XP 5.1 4. UA (phone), gateway or other hardware/software involved: UA with SipX 5. Your problem: When an unregistered UA calls from behind far-end symmetric ...

I see. I recommend that you enable the SIP Session-Timers at UA. It sends dummy SIP packets frequently during the session for refreshing. Does your UA support the Session-Timers feature? http://www.ietf.org/rfc/rfc4028.txt So far this UA does not, but we will manage to get it implemented. Thanks ...

>> OK, as I understand it this rule forces port-mapping keeping when an agent registers and regardless whether it is detected behind NAT or not? CORRECT! >> Is there a similar rule possible for a call-in from an unregistered UA? (as far as they are authorised, of course) how does the SIP Server get ...

If a SIP client supports a NAT traversal feature such as STUN, it should keep a port-mapping at router or firewall.. Try this DialPlan rule.. ------------------------ [Matching Patterns] $request = ^REGISTER [Deploy Patterns] &register.contact.nat = true $continue = true ------------------------ OK ...

lakeview wrote:What kind of SIP client product are you using??

Let you disable NAT/STUN feature at your SIP client.
If so, the keep address/port mapping will work.

I use a UA with sipX/2.9, and its STUN feature is disabled.

1. Brekeke Product Name and version: Brekeke SIP Server 2.4.4.8/286 2. Java version: 1.5.0_04 3. OS type and the version: XP 4. UA (phone), gateway or other hardware/software involved: 5. Select your network pattern from http://www.brekeke-sip.com/bbs/network/networkpatterns.html : pattern 3 6. Your ...

1. Brekeke Product Name and version: BSS version 2.4.3.0/286 2. Java version: 1.5.0_04 3. OS type and the version: XP 5.1 4. UA (phone), gateway or other hardware/software involved: 5. Select your network pattern from http://www.brekeke-sip.com/bbs/network/networkpatterns.html : pattern 3 6. Your ...