Iphonemms

We’ve freshly investigated a difficulty reported by a jiyuushikan.org MMSC customer wbelow iPhone 4 individuals were reporting a high volume of failed MMS message sfinishing.

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Our investigation argues that this problem is pertained to a software problem in the iPhone MMS client, as soon as operating outside of 3G coverage. Tright here is no trouble in the procedure of either the NowWAP Gatemethod or the jiyuushikan.org MMSC.

(Note: Problems with audit callbacks and also routing callbacks in the jiyuushikan.org MMSC have the right to reason similar sparse troubles if the internet server hosting the callbacks has difficulties with HTTP Keep-Alive sockets. To dominion out this being a trouble, we recommfinish editing MMSC.INI, and also under the header, add RoutingKeepAlive=No and AccountingKeepAlive=No.)

The iPhone shows up to have actually an all at once maximum timeout for sending an MMS message. If it cannot send the entire content of the MMS message within this timeout period, it aborts the attempt and retransforms an error indication to the sender. It is unclear exactly just how the iPhone determinates this timeout value, as our tests imply that it is somewhat variable and also varieties in between 2-1/2 and 3-1/2 minutes.

If an MMS message cannot be transmitted within this timeout duration, the iPhone gives up, and also instantly initiates a second attempt, and if that attempt falls short with a comparable timeout error, it returns the dreaded red “!” to show that the message sending failed. If this type of timeout error has actually emerged, the red “!” will certainly be returned after 5 to 7 minutes.

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This difficulty is not most likely to occur in 3G or HSPA coverage locations, yet is more likely to occur in 2.5G coverage locations, particularly areas that just have GPRS, yet not EDGE, or locations through weaker signal strength, because the data upfill speeds are sreduced, and it takes longer to transmit a message.

It appears that iOS 4.x will mainly try to send bigger image sizes in MMS messeras than previous releases. Throughout experimentation, we uncovered that among the test images that we were sfinishing, taken with the iPhone 4 camera, was 950KB in dimension. In order to sfinish a 950KB message in 2 minutes or much less, the netoccupational should be able to provide an average uppack rate of 80 Kbps, which is feasible with a strong EDGE class 10 connection (max feasible upfill speed is 118Kbps), yet not with GPRS (max feasible upload rate is 40Kbps).

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Note: When the iPhone is connected through EDGE, it must “E” next to the operator name, instead of “3G”. If the phone is associated via GPRS only, a dot is displayed instead.

Depending on operator configuration, the iPhone advertises itself to the MMSC as sustaining a maximum message dimension of 1MB (UAProf = http://www.apple.com/mms/uaprof.rdf) or 2MB (UAProf = http://iphonemms.apple.com/iphone/uaprof-2MB.rdf)

To rule out any kind of concerns perhaps pertained to either NowWAP or the jiyuushikan.org MMSC, these exact same timeout values were observed testing conventional concern operator locked iPhones on O2 in the UK and AT&T in the USA through 3G mode disabled on the phone.

Note that in jaildamaged iPhones, it is possible to connumber a “MMS Max Post Size” in the “Cellular File Network” settings. We experimented through lowering this worth, yet it appeared that when this worth was lowered, if a message was going to exceed this size value, the iPhone would easily fail the message via a red “!”, without actually attempting to sfinish the message. (Based upon these brief tests, it is not clear what algorithm the iPhone uses to scale dvery own a photo prior to sfinishing, as the 950KB photo that we referenced over actually has a aboriginal dimension of 2.7MB, and was taken with HDR enabled.)

The bottom line appears to be that sfinishing pictures using MMS will certainly generally fail if the iPhone 4 is operating in a 2.5G (“E” for EDGE or a dot for GPRS) environments. The difficulty is due to a sfinishing timeout enforced in the MMS client software in the gadget. This trouble deserve to just be resolved by changing this timeout in the MMS client software program implementation, or changing the MMS client to have an alternative to sfinish lower resolution photos once operating in 2.5G settings. There does not appear to be any kind of solution that can be enforced on the mobile operator side.

To stop frustration, it is recommfinished that individuals stop sfinishing image or video messeras when operating outside of a 3G coverage location.


For comments and additionally discussion, please click right here to visit the jiyuushikan.org Technical Forums (Discussion Board)...

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This is amazing. I don’t understand all of the techie jargon, yet I think I understand also enough.

I’d prefer to include that this trouble affects me (and also the majority of most likely various other AT&T customers) on 3G. I’ve been frustrated that I am never able to sfinish a photo message from my iPhone 4 once I am at residence. I view that stupid red “!”, and no matter how many kind of times I retry, it won’t work-related. But I discovered that if I attempt resfinishing the next day from work, the photo messperiods send via no difficulty.

I’ve searched around and also uncovered others that comordinary around equivalent problems, however never any kind of complete indevelopment. I read your write-up and also currently I understand why this happens to me.

At home, I have actually an AT&T 3G Microcell. This is an equipment that plugs right into my home broadband also network and offers a 3G signal for my iPhone. I read somewhere else that this device is capped with a 64Kbps upload max speed, which is listed below the 80Kbps minimum requirement that you point out below.

I wish AT&T (or Apple) would certainly review this. Of course I’m more frustrated via AT&T! 64Kbps is hardly what anyone would think about 3G speed!!! I tried AT&T assistance, and they tell me the Microcell is intfinished for voice, not information, and I should usage in residence WiFi for data. I execute usage in house WiFi for information accessibility on my iPhone, but MMS picture messperiods seem to use the Microcell. Is tbelow any type of method I have the right to connumber my iPhone 4 to sfinish MMS over WiFi?