Imagine I have 50 salespeople, and I know the URIs of all of their phones. When an INVITE comes in to SER, I want to keep trying to forward it to the salespeople, one at a time (in series, not in parallel), forever or until one of them accepts the call. (I randomize the order.)
QUESTION 1: At first, I tried rewriting the Request URI in a failure route each time t_relay() returned failure, and then calling t_relay() again. But t_relay() doesn't work that way -- when used in a failure route, it requires you to append a branch, and apparently ignores any changes in the Request URI after the failure happens.
OK, so in my failure route, I'll append a branch instead of rewriting the Request URI. But the default value of MAX_BRANCHES in config.h is only 12. I think this means I can never try to relay to more than 13 salespeople -- the first t_relay() call, plus 12 t_relay() calls in failure routes. Is this correct?
QUESTION 2: OK, so I'll make the value of MAX_BRANCHES greater than 12. But I see in modules/tm/tm.c that MAX_BRANCHES cannot be given a value greater than 31, since each branch occupies one bit in a 32-bit bitmap. So how can I do 50 stateful relays? Or, for that matter, an indefinite number?
Thank you for any help!
Tim
Yes, you need to append a new branch to initiate a new transaction. Your best bet, however, is to use lcr module and the q-value to serialize the contacts. LCR is in CVS head and in the experimental module for 0.9.x. g-) ----- Original Message ----- From: "Tim Klein" tkpublic@timklein.fastmail.fm To: serusers@lists.iptel.org Sent: Tuesday, November 22, 2005 2:39 AM Subject: [Serusers] How to do a large number of relay attempts?
Imagine I have 50 salespeople, and I know the URIs of all of their phones. When an INVITE comes in to SER, I want to keep trying to forward it to the salespeople, one at a time (in series, not in parallel), forever or until one of them accepts the call. (I randomize the order.)
QUESTION 1: At first, I tried rewriting the Request URI in a failure route each time t_relay() returned failure, and then calling t_relay() again. But t_relay() doesn't work that way -- when used in a failure route, it requires you to append a branch, and apparently ignores any changes in the Request URI after the failure happens.
OK, so in my failure route, I'll append a branch instead of rewriting the Request URI. But the default value of MAX_BRANCHES in config.h is only 12. I think this means I can never try to relay to more than 13 salespeople -- the first t_relay() call, plus 12 t_relay() calls in failure routes. Is this correct?
QUESTION 2: OK, so I'll make the value of MAX_BRANCHES greater than 12. But I see in modules/tm/tm.c that MAX_BRANCHES cannot be given a value greater than 31, since each branch occupies one bit in a 32-bit bitmap. So how can I do 50 stateful relays? Or, for that matter, an indefinite number?
Thank you for any help!
Tim
Serusers mailing list serusers@lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers
Thank you for the response, Greger! On your suggestion, I've read about the LCR module, and it does seem useful here. But the LCR functions (such as next_contacts()) also work by appending branches.
Am I correct in thinking that SER is not able to make more than 31 attempts to relay an INVITE, because it is not able to append more than 31 branches? (This question may be better for the developers mailing list, so I'm cross-posting there.)
If I am correct about that, then can anyone suggest a way to statefully forward an INVITE without appending a branch?
Thank you in advance!
Tim
At 6:46 AM +0100 11/22/05, Greger V. Teigre wrote:
Yes, you need to append a new branch to initiate a new transaction. Your best bet, however, is to use lcr module and the q-value to serialize the contacts. LCR is in CVS head and in the experimental module for 0.9.x. g-) ----- Original Message ----- From: "Tim Klein" tkpublic@timklein.fastmail.fm To: serusers@lists.iptel.org Sent: Tuesday, November 22, 2005 2:39 AM Subject: [Serusers] How to do a large number of relay attempts?
Imagine I have 50 salespeople, and I know the URIs of all of their phones. When an INVITE comes in to SER, I want to keep trying to forward it to the salespeople, one at a time (in series, not in parallel), forever or until one of them accepts the call. (I randomize the order.)
QUESTION 1: At first, I tried rewriting the Request URI in a failure route each time t_relay() returned failure, and then calling t_relay() again. But t_relay() doesn't work that way -- when used in a failure route, it requires you to append a branch, and apparently ignores any changes in the Request URI after the failure happens.
OK, so in my failure route, I'll append a branch instead of rewriting the Request URI. But the default value of MAX_BRANCHES in config.h is only 12. I think this means I can never try to relay to more than 13 salespeople -- the first t_relay() call, plus 12 t_relay() calls in failure routes. Is this correct?
QUESTION 2: OK, so I'll make the value of MAX_BRANCHES greater than 12. But I see in modules/tm/tm.c that MAX_BRANCHES cannot be given a value greater than 31, since each branch occupies one bit in a 32-bit bitmap. So how can I do 50 stateful relays? Or, for that matter, an indefinite number?
Thank you for any help!
Tim
Tim, There are two different types of branches: parallel and serial. If you branch in parallel, you append branches before t_relay and INVITEs are sent out to ALL the branches at the same time. Serial branches are created in on_failure and a new INVITE is sent when the first timed out, received busy etc. AFAIK the limit to the number of branches is for parallel branches. To your last question: A message is by definition (RFC) tightly connected to a branch. g-)
----- Original Message ----- From: "Tim Klein" tkpublic@timklein.fastmail.fm To: "Greger V. Teigre" greger@teigre.com; serusers@lists.iptel.org; serdev@lists.iptel.org Sent: Tuesday, November 22, 2005 7:07 PM Subject: Re: [Serusers] How to do a large number of relay attempts?
Thank you for the response, Greger! On your suggestion, I've read about the LCR module, and it does seem useful here. But the LCR functions (such as next_contacts()) also work by appending branches.
Am I correct in thinking that SER is not able to make more than 31 attempts to relay an INVITE, because it is not able to append more than 31 branches? (This question may be better for the developers mailing list, so I'm cross-posting there.)
If I am correct about that, then can anyone suggest a way to statefully forward an INVITE without appending a branch?
Thank you in advance!
Tim
At 6:46 AM +0100 11/22/05, Greger V. Teigre wrote:
Yes, you need to append a new branch to initiate a new transaction. Your best bet, however, is to use lcr module and the q-value to serialize the contacts. LCR is in CVS head and in the experimental module for 0.9.x. g-) ----- Original Message ----- From: "Tim Klein" tkpublic@timklein.fastmail.fm To: serusers@lists.iptel.org Sent: Tuesday, November 22, 2005 2:39 AM Subject: [Serusers] How to do a large number of relay attempts?
Imagine I have 50 salespeople, and I know the URIs of all of their phones. When an INVITE comes in to SER, I want to keep trying to forward it to the salespeople, one at a time (in series, not in parallel), forever or until one of them accepts the call. (I randomize the order.)
QUESTION 1: At first, I tried rewriting the Request URI in a failure route each time t_relay() returned failure, and then calling t_relay() again. But t_relay() doesn't work that way -- when used in a failure route, it requires you to append a branch, and apparently ignores any changes in the Request URI after the failure happens.
OK, so in my failure route, I'll append a branch instead of rewriting the Request URI. But the default value of MAX_BRANCHES in config.h is only 12. I think this means I can never try to relay to more than 13 salespeople -- the first t_relay() call, plus 12 t_relay() calls in failure routes. Is this correct?
QUESTION 2: OK, so I'll make the value of MAX_BRANCHES greater than 12. But I see in modules/tm/tm.c that MAX_BRANCHES cannot be given a value greater than 31, since each branch occupies one bit in a 32-bit bitmap. So how can I do 50 stateful relays? Or, for that matter, an indefinite number?
Thank you for any help!
Tim
Tim Klein writes:
Imagine I have 50 salespeople, and I know the URIs of all of their phones. When an INVITE comes in to SER, I want to keep trying to forward it to the salespeople, one at a time (in series, not in parallel), forever or until one of them accepts the call. (I randomize the order.)
i'm not sure if what you try to do is practical, since the calling phone is not likely to wait so long for a final answer to invite.
-- juha
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Greger V. Teigre -
Juha Heinanen -
Tim Klein