SIP Message and Header Restrictions
- Kelli Higdon
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Within the SIP Signaling object is a field labeled Message Restriction Setting. When this field is configured to Option 1, the feature imposes maximum lengths on incoming SIP messages, maximum lengths of the individual headers, and maximum number of specific headers contained within the incoming SIP message. The Tables below display the restrictions that are imposed when Option 1 is selected.
Option 1
SIP Restrictions
Entity - Option 1 | Limit | Restrictive Action |
|---|---|---|
Whole Message (Includes TCP/UDP and IP Headers)UDP: IP fragment supported | 6048 Bytes | Discard the signal |
Whole Message Body (Excluding CRLF) | 3000 Bytes | 413 Request Entity Too Large |
1 Message Body Line | No Restriction | No Restriction |
Request Line\Status Line | 256 Bytes | 400 Bad Request |
URI | No Restriction | No Restriction |
Default | Limit | Restrictive Action |
Whole Message (Excludes TCP/UDP and IP Headers) | 6144 Bytes | Discard the signal |
Whole Message Body (Excluding CRLF) | No Restriction | No Restriction |
1 Message Body Line | No Restriction | No Restriction |
Request Line\Status Line | No Restriction | No Restriction |
URI | 1024 Bytes | 414 Request URI Too Long |
SIP Header Restrictions
Headers | Limit (Max Bytes, Max Headers) Includes CRLF | Restrictive Action |
|---|---|---|
Call-ID | 136 Bytes, No Limt | 400 Bad Request |
History-Info | 512 Bytes, 6 Max | 400 Bad Request |
Min-SE | 256 Bytes, 1 Max | 400 Bad Request |
P-Access-Network-Info | 640 Bytes, No Limit | 400 Bad Request |
P-Area-Info | 256 Bytes, 1 Max | 400 Bad Request |
P-Asserty-Identity | 256 Bytes, 2 Max | 400 Bad Request |
P-Called-Party-ID | 640 Bytes, No Limit | 400 Bad Request |
P-Charging-Vector | 640 Bytes, 1 Max | 400 Bad Request |
P-Media-Authorization | 640 Bytes, No Limit | 400 Bad Request |
Privacy | 640 Bytes, 6 Max | 400 Bad Request |
Reason | 640 Bytes, No Limit | 400 Bad Request |
Record-Route | 512 Bytes, 6 Max | 400 Bad Request |
Referred-By | 640 Bytes, No Limit | 400 Bad Request |
Route | 512 Bytes, 6 Max | 400 Bad Request |
Security-Client | 640 Bytes, No Limit | 400 Bad Request |
Security-Verify | 640 Bytes, No Limit | 400 Bad Request |
Session-Expires | 256 Bytes, 1 Max | 400 Bad Request |
Via | 512 Bytes, 6 Max | 400 Bad Request |
X-CONTRACT-ADDR | 256 Bytes, 1 Max | 400 Bad Request |
X-GENERIC-NUM | 512 Bytes, 8 Max | 400 Bad Request |
xxxxx (All other Headers) | 256 Bytes, No Limit | 400 Bad Request |
Default
Headers | Limit (Max Bytes, Max Headers) Includes CRLF | Restrictive Action |
|---|---|---|
Allow | Unlimited Bytes, No Limit Additional: Data Field is empty | 400 Bad Request |
Call-ID | Unlimited Bytes, 1 Max Additional: Data Field is empty | 400 Bad Request |
Contact | Unlimited Bytes, No Limit | 400 Bad Request |
Content-Disposition | Unlimited Bytes, 1 Max | Â |
Content-Encoding | Unlimited Bytes, No Limit | Â |
Content-Language | Unlimited Bytes, 1 Max | Â |
Content-Length | Unlimited Bytes, 1 Max | Â |
Content Type | Unlimited Bytes, 1 Max | Â |
CSeq | Unlimited Bytes, 1 Max | Â |
Diversion | Unlimited Bytes, No Limit | Â |
Event | Unlimited Bytes, 1 Max | Â |
Expires | Unlimited Bytes, No Limit | Â |
From (Required) | Unlimited Bytes, No Limit | Â |
Max-Forwards | Unlimited Bytes, No Limit | Â |
Min-Expires | Unlimited Bytes, No Limit | Â |
Min-SE | Unlimited Bytes, 1 Max | Â |
Path | Unlimited Bytes, No Limit | Â |
P-Asserted-Identity | Unlimited Bytes, No Limit | Â |
P-Charge-Info | Unlimited Bytes, No Limit | Â |
P-Preferred-Identity | Unlimited Bytes, No Limit | Â |
Priority | Unlimited Bytes, No Limit | Â |
Privacy | Unlimited Bytes, 1 Max | Â |
Proxy-Require | Unlimited Bytes, No Limit | Â |
RAck | Unlimited Bytes, 1 Max | Â |
Reason | Unlimited Bytes, No Limit | Â |
Refer-To | Unlimited Bytes, 1 Max | Â |
Referred-By | Unlimited Bytes, 1 Max | Â |
Remote-Party-ID | Unlimited Bytes, No Limit | Â |
Replaces | Unlimited Bytes, 1 Max | Â |
Require | Unlimited Bytes, No Limit | Â |
Resource-Priority | Unlimited Bytes, No Limit | Â |
Retry-After | Unlimited Bytes, No Limit | Â |
RSeq | Unlimited Bytes, 1 Max | Â |
Session-Expires | Unlimited Bytes, 1 Max | Â |
Subscription-State | Unlimited Bytes, 1 Max | Â |
Supported | Unlimited Bytes, No Limit | Â |
Target-Dialog | Unlimited Bytes, 1 Max | Â |
To (Required) | Unlimited Bytes, 1 Max | Â |
User-to-User | Unlimited Bytes, No Limit | Â |
Via | Unlimited Bytes, No Limit Max | Â |
Warning | Unlimited Bytes, No Limit | Â |
X-DLGCIsdnTunnelingInfo | Unlimited Bytes, No Limit | Â |
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