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Python PJSIP DTMF error "Invalid value or argument (PJ_EINVAL)"

Yash Wanth

Fri, Feb 23, 2018 8:42 AM

Hi All,

I have compiled the source with version 2.7.1 along with python 3.6.
PJSIP works excellent as described. I have encountered an issue where when
sending the DTMF,

What am i doing:
#Registering the account
#Making a call
#Checking whether the Media state is active

Then calling the method* self.call.dial_dtmf("4") *

Thats when i am getting an error as:

self.call.dial_dtmf("4")
File "C:\Python36-32\lib\site-packages\pjsua.py", line 1761, in dial_dtmf
self._lib()._err_check("dial_dtmf()", self, err)
File "C:\Python36-32\lib\site-packages\pjsua.py", line 2722, in _err_check
raise Error(op_name, obj, err_code, err_msg)
pjsua.Error: Object: {Call sip:2002@192.168.100.127:5060},
operation=dial_dtmf(), error=b'Invalid value or argument (PJ_EINVAL)'

Also i have checked with SDP that there is 101 telephone-event is
available.shown below :

    Session Description Protocol
        Session Description Protocol Version (v): 0
        Owner/Creator, Session Id (o): 3cxPS 496286826496 76722208769

IN IP4 192.168.100.127
Session Name (s): 3cxPS Audio call
Connection Information (c): IN IP4 192.168.100.122
Time Description, active time (t): 0 0

       Media Description, name and address (m): audio 5004 RTP/AVP 0

8 9 109 101*
Media Attribute (a): sendrecv
Media Attribute (a): rtpmap:0 PCMU/8000
Media Attribute (a): ptime:20
Media Attribute (a): rtpmap:8 PCMA/8000
Media Attribute (a): rtpmap:9 G722/8000
Media Attribute (a): rtpmap:109 iLBC/8000
Media Attribute (a): fmtp:109 mode=30
Media Attribute (a): rtpmap:101 telephone-event/8000

           Media Attribute Fieldname: rtpmap*

```
           Media Format: 101*
```
```
           MIME Type: telephone-event*
```
```
           Sample Rate: 8000*
```

       Media Attribute (a): fmtp:101 0-15*

           Media Attribute Fieldname: fmtp*

           Media Format: 101 [telephone-event]*

           Media format specific parameters: 0-15*

I have checked sending the DTMF from the console app generated, and it
works flawless. But same is not working in python.
Same console app pjsua_app.py has errors and i am unable to run that to
test sending DTMF.

Can anybody let me where i am doing wrong or is there any other method to
send DTMF with RFC 2833.

--
vroom

Hi All, I have compiled the source with version 2.7.1 along with python 3.6. PJSIP works excellent as described. I have encountered an issue where when sending the DTMF, What am i doing: #Registering the account #Making a call #Checking whether the Media state is active # Then calling the method* self.call.dial_dtmf("4") * Thats when i am getting an error as: self.call.dial_dtmf("4") File "C:\Python36-32\lib\site-packages\pjsua.py", line 1761, in dial_dtmf self._lib()._err_check("dial_dtmf()", self, err) File "C:\Python36-32\lib\site-packages\pjsua.py", line 2722, in _err_check raise Error(op_name, obj, err_code, err_msg) pjsua.Error: Object: {Call sip:2002@192.168.100.127:5060}, operation=dial_dtmf(), error=b'Invalid value or argument (PJ_EINVAL)' Also i have checked with SDP that there is 101 telephone-event is available.shown below : Session Description Protocol Session Description Protocol Version (v): 0 Owner/Creator, Session Id (o): 3cxPS 496286826496 76722208769 IN IP4 192.168.100.127 Session Name (s): 3cxPS Audio call Connection Information (c): IN IP4 192.168.100.122 Time Description, active time (t): 0 0 * Media Description, name and address (m): audio 5004 RTP/AVP 0 8 9 109 101* Media Attribute (a): sendrecv Media Attribute (a): rtpmap:0 PCMU/8000 Media Attribute (a): ptime:20 Media Attribute (a): rtpmap:8 PCMA/8000 Media Attribute (a): rtpmap:9 G722/8000 Media Attribute (a): rtpmap:109 iLBC/8000 Media Attribute (a): fmtp:109 mode=30 *Media Attribute (a): rtpmap:101 telephone-event/8000* * Media Attribute Fieldname: rtpmap* * Media Format: 101* * MIME Type: telephone-event* * Sample Rate: 8000* * Media Attribute (a): fmtp:101 0-15* * Media Attribute Fieldname: fmtp* * Media Format: 101 [telephone-event]* * Media format specific parameters: 0-15* I have checked sending the DTMF from the console app generated, and it works flawless. But same is not working in python. Same console app pjsua_app.py has errors and i am unable to run that to test sending DTMF. Can anybody let me where i am doing wrong or is there any other method to send DTMF with RFC 2833. -- vroom