Hi all. We have a Merlin Legend Release 7 with PRI service. We have encountered an issue for now the second time and I am wondering if increasing the T310 timer will cause any issues. What is happening is we have AT&T PRIs and are in Chicago, if we call a certain Verizon cell phone based in LA, it will ring once or twice and then go to fast busy. We've had multiple calls with the AT&T engineers and after they placed a trap on a test call, they see a T310 expiry error (T310: Times the network delay following the receipt of a call preceding message on an outgoing call).
In this case it is because Verizon is for whatever reason not sending back a certain message that the call is proceeding (if I remember correctly, I bow down to those with vastly more knowledge on this), therefore our phone system sends the call to fast busy after 10 seconds (the T310 timer setting). AT&T needs to work out why Verizon isn't sending them that message (if AT&T tests on the Sprint network, they get the proper message back from Verizon and the call goes through).
Anyways, AT&T says the T310 timer setting is usually 10 seconds and I've checked our outbound PRI and it is 10 seconds...however, Avaya documentation (Sys 7 System Programming) says the default is 60 seconds. I checked our inbound PRI and our phone technicians left that one at 60. My question is would I be able to increase the T310 timer setting without causing other issues? I changed it briefly to 30 seconds and the call went through fine, since the caller/voicemail picks up before 30 seconds have gone by. We had this issue once before when someone was traveling internationally and now I realize that it was probably because it took longer than 10 seconds to find the customers location, so the phone system threw out the call. Thanks everyone...
In this case it is because Verizon is for whatever reason not sending back a certain message that the call is proceeding (if I remember correctly, I bow down to those with vastly more knowledge on this), therefore our phone system sends the call to fast busy after 10 seconds (the T310 timer setting). AT&T needs to work out why Verizon isn't sending them that message (if AT&T tests on the Sprint network, they get the proper message back from Verizon and the call goes through).
Anyways, AT&T says the T310 timer setting is usually 10 seconds and I've checked our outbound PRI and it is 10 seconds...however, Avaya documentation (Sys 7 System Programming) says the default is 60 seconds. I checked our inbound PRI and our phone technicians left that one at 60. My question is would I be able to increase the T310 timer setting without causing other issues? I changed it briefly to 30 seconds and the call went through fine, since the caller/voicemail picks up before 30 seconds have gone by. We had this issue once before when someone was traveling internationally and now I realize that it was probably because it took longer than 10 seconds to find the customers location, so the phone system threw out the call. Thanks everyone...