[SR-Users] How to eliminate Content-Length:0 from sl_send_reply
Pranathi Venkatayogi
pvenkatayogi at cyracom.com
Tue Apr 25 15:43:21 CEST 2017
I want to place the customer call on hold while I look for the "agent" to answer the chat call.
Daniel confirms that for a brief moment I can hold the calls on Kamailio. Eventually we are looking for "FreeSwitch" to help us.
Hence this is what I am trying:
1) When customer invite comes - let it terminate on Kamailio for a while
- If msrp message comes from customer, reply "pls hold for agent to be available" from Kamailio
2) When the agent becomes available, send "Refer" to customer to connect back again.
- Now customer and agent can talk directly to each other.
So, for the step 1, I am generating SDP from Kamailio so Customer has everything setup properly.
How do I do that from config?
If this is not right way to place a MSRP chat call on hold, what is the right way. Please suggest.
Thanks
Pranathi
-----Original Message-----
From: sr-users [mailto:sr-users-bounces at lists.kamailio.org] On Behalf Of Alex Balashov
Sent: Tuesday, April 25, 2017 8:31 AM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: Re: [SR-Users] How to eliminate Content-Length:0 from sl_send_reply
Why are you generating your own SDP body? What are you trying to accomplish?
Every once in a while there is a legitimate reason, but 99% of the time that is the wrong approach to whatever problem you're trying to solve.
-- Alex
> On Apr 25, 2017, at 9:06 AM, Pranathi Venkatayogi <pvenkatayogi at cyracom.com> wrote:
>
> Hi Alex,
> I am adding my own SDP body to the reply and set the content-length to 350 already.
> The extra content-length: 0 is causing it to be malformed.
>
> Question: Is there a way to generate SIP reply with SDP payload from config file. I saw there is uac_send_req but no support for reply so far...Please suggest.
>
> I want to send this message from Kamailio:
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP
> 10.0.0.5:52653;rport=52653;branch=z9hG4bKPj60f74c5d68574dc5ae3cbfdd21b
> a5f12;received=10.11.200.48
> From: "cust1"
> <sip:cust1 at devtranslation.sms-test.cyracom.com>;tag=0cba06eab62d47d1ac
> e9c8834bbe0396
> To:
> <sip:spanish at devtranslation.sms-test.cyracom.com>;tag=02eb90a2953b2668
> 2001111237ca6e13-e339
> Call-ID: 7d383971684b44f792cfe84043bf8b5a
> CSeq: 15351 INVITE
> Content-Type: application/sdp
> Content-Length: 350
>
> v=0
> o=- 3688213899 3688213900 IN IP4 10.99.52.17 s=Blink 1.4.2 (Windows)
> t=0 0
> m=message 2855 TCP/MSRP *
> c=IN IP4 10.99.52.17
> a=path:msrps://10.99.52.17:2855/12673656159856;tcp
> a=accept-types:message/cpim text/* image/*
> application/im-iscomposing+xml
> a=accept-wrapped-types:text/* image/* application/im-iscomposing+xml
> a=setup:active
>
> -----Original Message-----
> From: sr-users [mailto:sr-users-bounces at lists.kamailio.org] On Behalf
> Of Alex Balashov
> Sent: Tuesday, April 25, 2017 7:24 AM
> To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
> Subject: Re: [SR-Users] How to eliminate Content-Length:0 from
> sl_send_reply
>
> Hello,
>
> What leads you to the conclusion that the
>
> Content-Length: 0
>
> header is "extra", and in need of a "workaround"?
>
> -- Alex
>
>> On Tue, Apr 25, 2017 at 12:21:32PM +0000, Pranathi Venkatayogi wrote:
>>
>> Hi,
>> How do I eliminate Content-Length:0 from sip reply when using sl_send_reply?
>> I wanted to generate 200 ok, with SDP payload. I appended headers like below. The packet seems ok except there is extra "Content-Length:0", which is causing problems. Any workarounds?
>>
>> The packet being generated is: Note the extra content-length: 0 at the end.
>> SIP/2.0 200 OK
>> Via: SIP/2.0/UDP
>> 10.0.0.12:59404;rport=59404;branch=z9hG4bKPjb7d0391f8f7f479b812f6e5fe
>> a
>> dfa3c5;received=10.11.200.46
>> From: "cust1"
>> <sip:cust1 at devtranslation.sms-test.cyracom.com>;tag=afcffa277e2a43dc8
>> 8
>> fafc612f538864
>> To:
>> <sip:spanish at devtranslation.sms-test.cyracom.com>;tag=37b119f34ca40c1
>> 5
>> 8c5b7306e1aa8d72.b73a
>> Call-ID: 7f73e5d03e15425395fac930eae423bd
>> CSeq: 31419 INVITE
>> Content-Type: application/sdp
>> Content-Length: 350
>>
>> v=0
>> o=- 3688213899 3688213900 IN IP4 10.99.52.17 s=Blink 1.4.2 (Windows)
>> t=0 0
>> m=message 2855 TCP/MSRP *
>> c=IN IP4 10.99.52.17
>> a=path:msrps://10.99.52.17:2855/116701522521345;tcp
>> a=accept-types:message/cpim text/* image/*
>> application/im-iscomposing+xml
>> a=accept-wrapped-types:text/* image/* application/im-iscomposing+xml
>> a=setup:active
>> Content-Length: 0
>>
>> Code in config is:
>> append_to_reply("Content-Type: application/sdp\r\n");
>> append_to_reply("Content-Length: 350\r\n");
>> append_to_reply("\r\n");
>> append_to_reply("v=0\r\n");
>> append_to_reply("o=- 3688213899 3688213900 IN IP4 MY_IP_ADDR\r\n");
>> append_to_reply("s=Blink 1.4.2 (Windows)\r\n");
>> append_to_reply("t=0 0\r\n");
>> append_to_reply("m=message 2855 TCP/MSRP *\r\n");
>> append_to_reply("c=IN IP4 MY_IP_ADDR\r\n");
>> append_to_reply("a=path:msrps://MY_IP_ADDR:2855/$var(ssessid);tcp\r\n");
>> append_to_reply("a=accept-types:message/cpim text/* image/* application/im-iscomposing+xml\r\n");
>> append_to_reply("a=accept-wrapped-types:text/* image/* application/im-iscomposing+xml\r\n");
>> append_to_reply("a=setup:active\r\n");
>>
>> sl_send_reply("200", "OK");
>>
>> Thanks,
>> Pranathi Venkatayogi
>> System Developer II
>> (520) 745-9447 x4466
>> www.cyracom.com<http://www.cyracom.com/>
>>
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>
> --
> Alex Balashov | Principal | Evariste Systems LLC
>
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>
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