tests/channels/pjsip/sdp_mandatory_lines: Added test to check the validity of SDP s= and o= lines

This new test verifies that the SDP Session Name (s=) and
Origin (o=) lines are present and contain valid data, as required by RFC 8866.

1-Added SIPp scenario to initiate a call with
  validation on the SDP session (s=) and origin (o) lines.
2-Added Asterisk configuration (pjsip.conf, extensions.conf) to
  support the test.
3-Registered the new test in the pjsip test suite.

Author: AlexisHadj

tests/channels/pjsip/sdp_mandatory_lines/configs/ast1/extensions.conf

@@ -0,0 +1,8 @@
+[general]
+static=yes
+writeprotect=no
+
+[default]
+exten => 100,1,NoOp(Starting SDP Mandatory Lines Test)
+ same => n,Dial(PJSIP/testuser)
+ same => n,Hangup()

tests/channels/pjsip/sdp_mandatory_lines/configs/ast1/pjsip.conf

@@ -0,0 +1,20 @@
+[global]
+debug=yes
+
+[transport-udp]
+type=transport
+protocol=udp
+bind=0.0.0.0:5060
+
+[testuser]
+type=aor
+contact=sip:testuser@127.0.0.1:5061
+
+[testuser]
+type=endpoint
+context=default
+allow=!all,ulaw
+aors=testuser
+direct_media=no
+sdp_session=
+sdp_owner=

tests/channels/pjsip/sdp_mandatory_lines/sipp/check_sdp_lines.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="ISO-8859-1" ?>
+<!DOCTYPE scenario SYSTEM "sipp.dtd">
+
+<scenario name="Check SDP lines">
+
+  <recv request="INVITE">
+<!--sdp session s= field cannot be empty-->
+    <ereg regexp="s=[^\r\n]+"
+          search_in="body"
+          check_it="true"
+          assign_to="1" />
+<!--sdp Owner  o=<username> <sess-id> <sess-version> <nettype> <addrtype> <address>-->
+    <ereg regexp="o=\S+ [0-9]+ [0-9]+ IN IP[46] \S+"
+          search_in="body"
+          check_it="true"
+          assign_to="2" />
+  </recv>
+
+  <send>
+    <![CDATA[
+      SIP/2.0 200 OK
+      [last_Via:]
+      [last_From:]
+      [last_To:];tag=[call_number]
+      [last_Call-ID:]
+      [last_CSeq:]
+      Contact: <sip:[local_ip]:[local_port];transport=[transport]>
+      Content-Type: application/sdp
+      Content-Length: [len]
+
+      v=0
+      o=user1 12345678 1234567890 IN IP[local_ip_type] [local_ip]
+      s=-
+      c=IN IP[local_ip_type] [local_ip]
+      t=0 0
+      m=audio [media_port] RTP/AVP 0
+      a=rtpmap:0 PCMU/8000
+    ]]>
+  </send>
+
+  <recv request="ACK" crlf="true">
+  </recv>
+
+</scenario>

tests/channels/pjsip/sdp_mandatory_lines/test-config.yaml

@@ -0,0 +1,35 @@
+testinfo:
+    summary: 'Verify PJSIP SDP s= and o= lines are non-empty'
+    description: |
+        This test ensures that outbound SDP from Asterisk
+        comply with RFC 8866 by verifying that the Session Name (s=) and
+        Owner/Creator (o=) lines are present and contain valid data.'
+
+test-modules:
+    test-object:
+        config-section: test-config
+        typename: 'sipp.SIPpTestCase'
+    modules:
+        -
+            config-section: orig-config
+            typename: 'pluggable_modules.Originator'
+
+test-config:
+    test-iterations:
+        -
+            scenarios:
+                - { 'key-args': {'scenario': 'check_sdp_lines.xml', '-s': 'testuser', '-p': '5061'}, 'stop-relative': 'True' }
+
+orig-config:
+    channel: 'PJSIP/testuser'
+
+properties:
+    dependencies:
+        - python: 'starpy'
+        - sipp:
+            version: 'v3.1'
+        - asterisk: 'chan_pjsip'
+        - asterisk: 'res_pjsip'
+    tags:
+        - pjsip
+        - sdp

tests/channels/pjsip/tests.yaml

@@ -75,3 +75,4 @@ tests:
     - test: 'non_negotiated_frame_SSRC_change'
     - test: 'content_disposition'
     - test: 'reinvite_after_bye'
+    - test: 'sdp_mandatory_lines'