Hi, Which port range are you using for RTP at the SIP Server? 10000-10999 If you disable RTP-Relay, does the issue happen still? As i said only one time this problem happened and It would be very helpful if I knew if it was PBX problem or maybe Linux. Because server is in production mode when It is ...

Thank u for your reply,

RTP-Relay is ON.
How many concurrent calls?
Max 12 calls
Are there any VIDEO calls?
No,
What kind of SIP client are users using
Linksys IP IPHONE spa922,SPA942

Thank u for your reply, The number of RTP port range is already far bigger than number of users. Also after I rebooted linux , i did not experience this again and when it happend, 7 out of 10 calls had this type of Port Allocation failed 486 error. I dont know what to say. I will change it and see ...

Port Allocation failed 486 was shown on PBX call logs.
Nothing was shown under the ext on the phone, just call ended.

1. Brekeke Product Name and version: Brekeke PBX, Version 2.2.6.2 , Pro 2. Java version: 1.6.0_11 3. OS type and the version: linux 2.6.18-92.el5 4. UA (phone), gateway or other hardware/software involved: LinkSYS SPA922 5. Select your network pattern from http://www.brekeke-sip.com/bbs/network ...