Hi, I will connect my OpenSer with a Nortel (SIP to PSTN gateway) for incoming/outgoings call to/from PSTN.
I have a doubt: if an OpenSer user (200@mydomain.org) receives an incoming call from gateway, could he REFER the call to 201@mydomain.org?
This is: do ITSP gateways allow REFER to SIP users subcribers to my OpenSer? I understand they could not accept REFER's to PSTN number because accounting issues (gateway UAC receving a REFER and calling to PSTN?).
Thanks for any explanation.
Iñaki Baz Castillo schrieb:
Hi, I will connect my OpenSer with a Nortel (SIP to PSTN gateway) for incoming/outgoings call to/from PSTN.
I have a doubt: if an OpenSer user (200@mydomain.org) receives an incoming call from gateway, could he REFER the call to 201@mydomain.org?
This is: do ITSP gateways allow REFER to SIP users subcribers to my OpenSer? I understand they could not accept REFER's to PSTN number because accounting issues (gateway UAC receving a REFER and calling to PSTN?).
Usually it depends on the configuration of the gateway. Thus, I would add some screening of REFER and 3xx to the proxy.
regards klaus
El Thursday 15 November 2007 12:44:31 Klaus Darilion escribió:
Iñaki Baz Castillo schrieb:
Hi, I will connect my OpenSer with a Nortel (SIP to PSTN gateway) for incoming/outgoings call to/from PSTN.
I have a doubt: if an OpenSer user (200@mydomain.org) receives an incoming call from gateway, could he REFER the call to 201@mydomain.org?
This is: do ITSP gateways allow REFER to SIP users subcribers to my OpenSer? I understand they could not accept REFER's to PSTN number because accounting issues (gateway UAC receving a REFER and calling to PSTN?).
Usually it depends on the configuration of the gateway. Thus, I would add some screening of REFER and 3xx to the proxy.
Sorry Klaus, I don't understnad what you mean with "screening of REFER and 3XX to the proxy", could you explain it please?
Thanks a lot.
Iñaki Baz Castillo schrieb:
El Thursday 15 November 2007 12:44:31 Klaus Darilion escribió:
Iñaki Baz Castillo schrieb:
Hi, I will connect my OpenSer with a Nortel (SIP to PSTN gateway) for incoming/outgoings call to/from PSTN.
I have a doubt: if an OpenSer user (200@mydomain.org) receives an incoming call from gateway, could he REFER the call to 201@mydomain.org?
This is: do ITSP gateways allow REFER to SIP users subcribers to my OpenSer? I understand they could not accept REFER's to PSTN number because accounting issues (gateway UAC receving a REFER and calling to PSTN?).
Usually it depends on the configuration of the gateway. Thus, I would add some screening of REFER and 3xx to the proxy.
Sorry Klaus, I don't understnad what you mean with "screening of REFER and 3XX to the proxy", could you explain it please?
For example, if the system is a POTS replacement (no PBX feature, just VoIP-VoIP and VoIP-PSTN with phone calls) then I would: 1. if method==REFER sl_reply("403",""); 2. activate a failure route and if response code = 3xx then sl_send_reply("500",)
If the system also offers PBX features (call transfer ...) then you can not just block it - but you can screen it - e.g. for REFER requests check if the URI in the Refer-To header does not contain premium rate phone numbers, or that REFERs are not sent to the gateway ...
regards klaus
Thanks a lot.
El Thursday 15 November 2007 13:18:29 Klaus Darilion escribió:
Sorry Klaus, I don't understnad what you mean with "screening of REFER and 3XX to the proxy", could you explain it please?
For example, if the system is a POTS replacement (no PBX feature, just VoIP-VoIP and VoIP-PSTN with phone calls) then I would:
- if method==REFER sl_reply("403","");
- activate a failure route and if response code = 3xx then
sl_send_reply("500",)
If the system also offers PBX features (call transfer ...) then you can not just block it - but you can screen it - e.g. for REFER requests check if the URI in the Refer-To header does not contain premium rate phone numbers, or that REFERs are not sent to the gateway ...
Ok, understood. Thanks a lot.
Hola Iñaki,
Hi, I will connect my OpenSer with a Nortel (SIP to PSTN gateway) for incoming/outgoings call to/from PSTN.
I have a doubt: if an OpenSer user (200@mydomain.org) receives an incoming call from gateway, could he REFER the call to 201@mydomain.org?
This is: do ITSP gateways allow REFER to SIP users subcribers to my OpenSer? I understand they could not accept REFER's to PSTN number because accounting issues (gateway UAC receving a REFER and calling to PSTN?).
As with rpid/pai, some carriers will accept and others don't.
Saludos JesusR.
------------------------------------ Jesus Rodriguez VozTelecom Sistemas, S.L. jesusr@voztele.com http://www.voztele.com Tel. 902360305 -------------------------------------
El Thursday 15 November 2007 13:14:02 Jesus Rodriguez escribió:
Hola Iñaki,
Hi, I will connect my OpenSer with a Nortel (SIP to PSTN gateway) for incoming/outgoings call to/from PSTN.
I have a doubt: if an OpenSer user (200@mydomain.org) receives an incoming call from gateway, could he REFER the call to 201@mydomain.org?
This is: do ITSP gateways allow REFER to SIP users subcribers to my OpenSer? I understand they could not accept REFER's to PSTN number because accounting issues (gateway UAC receving a REFER and calling to PSTN?).
As with rpid/pai, some carriers will accept and others don't.
At least it's nice to know that the possibility may exist :)
Refer works with cisco media GWs. Dunno about others. Re-INVITE with Replaces also works. They don't both work on the same code train yet;) Two different bug fixes not yet integrated into a single code release. /a
On Nov 15, 2007, at 6:33 AM, Iñaki Baz Castillo ibc@in.ilimit.es wrote:
Hi, I will connect my OpenSer with a Nortel (SIP to PSTN gateway) for incoming/outgoings call to/from PSTN.
I have a doubt: if an OpenSer user (200@mydomain.org) receives an incoming call from gateway, could he REFER the call to 201@mydomain.org?
This is: do ITSP gateways allow REFER to SIP users subcribers to my OpenSer? I understand they could not accept REFER's to PSTN number because accounting issues (gateway UAC receving a REFER and calling to PSTN?).
Thanks for any explanation.
-- Iñaki Baz Castillo ibc@in.ilimit.es
Users mailing list Users@lists.openser.org http://lists.openser.org/cgi-bin/mailman/listinfo/users
Alan Crosswell writes:
Refer works with cisco media GWs. Dunno about others. Re-INVITE with Replaces also works. They don't both work on the same code train yet;) Two different bug fixes not yet integrated into a single code release.
alan,
do you know if there is anywhere a document that lists what headers cisco ios gw acts upon? it is really scary if such a list does not exist. if i remember correctly, cisco used to accept cc-diversion header as charging number header. perhaps they still do and may be there are others that are as dangerous.
-- juha
Juha Heinanen schrieb:
Alan Crosswell writes:
Refer works with cisco media GWs. Dunno about others. Re-INVITE with Replaces also works. They don't both work on the same code train yet;) Two different bug fixes not yet integrated into a single code release.
alan,
do you know if there is anywhere a document that lists what headers cisco ios gw acts upon? it is really scary if such a list does not exist. if i remember correctly, cisco used to accept cc-diversion header as charging number header. perhaps they still do and may be there are others that are as dangerous.
Maybe we need a remove_hf_except() function to strip all not explicitly allowed headers:
remove_hf_except("From|To|Via|Record-Route|Contact|PAI|CSeq|???????")
or something similar in result.
regards klaus
-
Alan Crosswell -
Iñaki Baz Castillo -
Jesus Rodriguez -
jh＠tutpro.com -
Klaus Darilion