res_pjsip.c: Added disable_rport option for pjsip.conf

Currently when the pjsip making an outgoing request, it keep adding the
rport parameter in a request message as a default.

This causes unexpected rport handle at the other end.

Added option for disable this behaviour in the pjsip.conf.

This is a system option, but working as a gloabl option.

ASTERISK-28959

Change-Id: I9596675e52a742774738b5aad5d1fec32f477abc

contrib/ast-db-manage/config/versions/79290b511e4b_pjsip_add_disable_rport.py

@@ -0,0 +1,39 @@
+"""pjsip add disable_rport
+
+Revision ID: 79290b511e4b
+Revises: fbb7766f17bc
+Create Date: 2020-06-25 22:21:37.529880
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '79290b511e4b'
+down_revision = 'fbb7766f17bc'
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import ENUM
+
+AST_BOOL_NAME = 'ast_bool_values'
+# We'll just ignore the n/y and f/t abbreviations as Asterisk does not write
+# those aliases.
+AST_BOOL_VALUES = [ '0', '1',
+                    'off', 'on',
+                    'false', 'true',
+                    'no', 'yes' ]
+
+
+def upgrade():
+    ############################# Enums ##############################
+
+    # ast_bool_values has already been created, so use postgres enum object
+    # type to get around "already created" issue - works okay with mysql
+    ast_bool_values = ENUM(*AST_BOOL_VALUES, name=AST_BOOL_NAME, create_type=False)
+
+    op.add_column('ps_systems', sa.Column('disable_rport', ast_bool_values))
+
+
+def downgrade():
+    if op.get_context().bind.dialect.name == 'mssql':
+        op.drop_constraint('ck_ps_systems_disable_rport_ast_bool_values','ps_systems')
+    op.drop_column('ps_systems', 'disable_rport')