[asterisk-bugs] [JIRA] (ASTERISK-22157) res_sip_dtmf_info: Support sending of 'raw' DTMF

[Matt Jordan (JIRA)]

Matt Jordan created ASTERISK-22157:
--------------------------------------

             Summary: res_sip_dtmf_info: Support sending of 'raw' DTMF
                 Key: ASTERISK-22157
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-22157
             Project: Asterisk
          Issue Type: Bug
          Components: Resources/res_sip
    Affects Versions: 12
            Reporter: Matt Jordan


Currently, {{res_sip_dtmf_info}} will parse an SDP that looks something like the packet below:

{noformat}
  <send retrans="500">
	<![CDATA[

		INFO sip:test@[remote_ip]:[remote_port] SIP/2.0
		Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
		Max-Forwards: 70
		Content-Length: [len]
		From: test1 <sip:guest1@[local_ip]:[local_port]>;tag=[call_number]
		To: test <sip:test@[remote_ip]:[remote_port]>[peer_tag_param]
		Call-ID: [call_id]
		CSeq: 2 INFO
		Supported: timer
		Content-Type: application/dtmf-relay
		Contact: sip:test@[local_ip]:[local_port]
		Supported: replaces
		User-Agent: Aastra 480i Cordless/1.4.3.1001 Brcm Callctrl/1.5.1.0 MxSF/v3.2.8.45

		Signal=1
		Duration=160
	]]>
  </send>
{noformat}

Unfortunately, sometimes DTMF is sent without any parameters, i.e., no "Signal" or "Duration":

{noformat}
  <send retrans="500">
	<![CDATA[

		INFO sip:test@[remote_ip]:[remote_port] SIP/2.0
		Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
		Max-Forwards: 70
		Content-Length: [len]
		From: test1 <sip:guest1@[local_ip]:[local_port]>;tag=[call_number]
		To: test <sip:test@[remote_ip]:[remote_port]>[peer_tag_param]
		Call-ID: [call_id]
		CSeq: 2 INFO
		Supported: timer
		Content-Type: application/dtmf-relay
		Contact: sip:test@[local_ip]:[local_port]
		Supported: replaces
		User-Agent: Aastra 480i Cordless/1.4.3.1001 Brcm Callctrl/1.5.1.0 MxSF/v3.2.8.45

                1
	]]>
  </send>
{noformat}

That's a DTMF "1". The duration is inferred.

The module should be able to handle this as well.

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