You can edit these attributes through the Admin Console or through the following get and set commands
To get the values of all attributes of the SIP service connection pool, use the following command: asadmin get server-config.sip-service.connection-pool.*
Queue size(queue-size-in-bytes): Specifies the maximum number of messages that can be queued until threads are available to process them for SIP listeners. The default is —1 and specifies that there is no limit on the number of messages.
Size of Receive Buffer (receive-buffer-size-in-bytes): Specifies the size of the byte buffer that is used to read from the socket channel. By default, this property is tuned to the socket channel receive buffer size.
Size of Send Buffer (send-buffer-size-in-bytes): Specifies the maximium size of the SIP message that can be written out. By default, this property is set to 8192.
To set an attribute of the SIP service connection pool, use the set command as follows: asadmin set server-config.sip-service.connection-pool.receive-buffer-size-in-bytes=10