I have another thread going on about incoming sip calls dropping after 32 seconds. I have this working for the most part now. The weird thing now is the sip trunks work well on incoming and outgoing. What is happening now is that at midnight every night the trunks go out of service. The only way they come back is a reboot of phone system. Then they work again until midnight the next day. I log into the firewalll and I can see the call come in and be accepted but it never hits the auto attendant. The call goes to busy. The sip provider sent me a screen shot of the pcap and it shows 503 code